BUG: decimal.Decimal treated as string in DataFrame.to_excel()

Pandas version checks

[X] I have checked that this issue has not already been reported.
[X] I have confirmed this bug exists on the latest version of pandas.
[ ] I have confirmed this bug exists on the main branch of pandas.

Reproducible Example

#!/usr/bin/env python3
import pandas as pd
from decimal import Decimal

df = pd.DataFrame({
    'foo': list('ABC'),
    'val': [
        Decimal('332344'),
        Decimal('6.324'),
        Decimal('87.397812')
    ]
})

print(df)
df.to_excel('p.xlsx')

from openpyxl import Workbook
wb = Workbook()
ws = wb.active

the_float = 1.2345
ws['A1'] = Decimal('1.2345')
ws['A2'] = the_float

wb.save('x.xlsx')

Issue Description

I use decimal.Decimal as type for float values in a DataFrame. Exporting them via to_excel() resulting in Excel cells with strings not floats. I tried xlsxwriter and openpyxl as engine.

See my MWE it seems that openpyxl itself can handle Decimal very well. The result is a real float not a string.

So the problem must somewhere in the pandas layer.

btw: Your Issue formula is to restrictive. I have no way to test the issue on the current upstream version. There are strict technical reasons for this. I haven't tested with upstream but checked the checkbox to be able to submit the Issue.

Expected Behavior

Create real float values in the Excel cells.

Installed Versions

>>> pandas.show_versions()
[DEBUG] matplotlib data path: .....AppData\Roaming\Python\Python39\site-packages\matplotlib\mpl-data
[DEBUG] CONFIGDIR=C:\Users\buhtzch\.matplotlib
[DEBUG] interactive is False
[DEBUG] platform is win32
[DEBUG] loaded modules: ['sys', 'builtins', '_frozen_importlib', '_imp', '_thread', '_warnings', '_weakref', '_io', 'marshal', 'nt', 'winreg', '_frozen_importlib_external', 'time', 'zipimport', '_codecs', 'codecs', 'encodings.aliases', 'encodings', 'encodings.utf_8', 'encodings.cp1252', '_signal', 'encodings.latin_1', '_abc', 'abc', 'io', '__main__', '_stat', 'stat', '_collections_abc', 'genericpath', 'ntpath', 'os.path', 'os', '_sitebuiltins', '_locale', '_bootlocale', 'types', 'importlib._bootstrap', 'importlib._bootstrap_external', 'warnings', 'importlib', 'importlib.machinery', '_heapq', 'heapq', 'itertools', 'keyword', '_operator', 'operator', 'reprlib', '_collections', 'collections', 'collections.abc', '_functools', 'functools', 'contextlib', 'enum', '_sre', 'sre_constants', 'sre_parse', 'sre_compile', 'copyreg', 're', 'typing.io', 'typing.re', 'typing', 'importlib.abc', 'importlib.util', 'mpl_toolkits', 'sphinxcontrib', 'site', 'token', 'tokenize', 'linecache', 'traceback', '_weakrefset', 'weakref', '_string', 'string', 'threading', 'atexit', 'logging', 'posixpath', 'fnmatch', 'errno', 'urllib', 'urllib.parse', 'pathlib', 'math', '_datetime', 'datetime', '_struct', 'struct', '_compat_pickle', '_pickle', 'pickle', 'copy', '_ast', 'ast', '_opcode', 'opcode', 'dis', 'inspect', 'dataclasses', '_uuid', 'uuid', 'numbers', '_bisect', 'bisect', '_random', '_sha512', 'random', '_decimal', 'decimal', 'fractions', '_statistics', 'statistics', 'numpy._globals', 'numpy.__config__', 'glob', '_ctypes', 'ctypes._endian', 'ctypes', 'numpy._distributor_init', '__future__', '_json', 'json.scanner', 'json.decoder', 'json.encoder', 'json', 'numpy._version', 'numpy.version', 'numpy.core._multiarray_umath', 'numpy.compat._inspect', 'numpy.compat.py3k', 'numpy.compat', 'numpy.core.overrides', 'numpy.core.multiarray', 'numpy.core.umath', 'numpy.core._string_helpers', 'numpy.core._dtype', 'numpy.core._type_aliases', 'numpy.core.numerictypes', 'numpy.core._exceptions', 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'attr.converters', 'attr.filters', 'attr.validators', 'attr._cmp', 'attr._funcs', 'attr._version_info', 'attr._next_gen', 'attr', 'importlib._common', 'importlib.resources', 'jsonschema._utils', 'jsonschema.exceptions', 'idna.package_data', 'idna.idnadata', 'idna.intranges', 'idna.core', 'idna', 'jsonschema._format', 'pyrsistent._transformations', 'pvectorc', 'pyrsistent._pvector', 'pyrsistent._pmap', 'pyrsistent._pset', 'pyrsistent._pbag', 'pyrsistent._plist', 'pyrsistent._pdeque', 'pyrsistent._checked_types', 'pyrsistent._field_common', 'pyrsistent._precord', 'pyrsistent._pclass', 'pyrsistent._immutable', 'pyrsistent._helpers', 'pyrsistent._toolz', 'pyrsistent', 'jsonschema._types', 'http', '_ssl', 'ssl', 'http.client', 'urllib.response', 'urllib.error', 'nturl2path', 'urllib.request', 'jsonschema._legacy_validators', 'jsonschema._validators', 'jsonschema.validators', 'jsonschema.protocols', 'jsonschema', 'styleframe.version', 'styleframe.tests', 'styleframe.command_line.tests', 'styleframe.command_line.tests.json_schema', 'styleframe.command_line.commandline', 'styleframe.deprecations', 'unittest.util', 'unittest.result', 'difflib', 'unittest.case', 'unittest.suite', 'unittest.loader', 'unittest.signals', 'unittest.runner', 'unittest.main', 'unittest', 'concurrent', 'concurrent.futures._base', 'concurrent.futures', 'asyncio.constants', 'asyncio.format_helpers', 'asyncio.base_futures', 'asyncio.log', 'asyncio.coroutines', '_contextvars', 'contextvars', 'asyncio.exceptions', 'asyncio.base_tasks', '_asyncio', 'asyncio.events', 'asyncio.futures', 'asyncio.protocols', 'asyncio.transports', 'asyncio.sslproto', 'asyncio.locks', 'asyncio.tasks', 'asyncio.staggered', 'asyncio.trsock', 'asyncio.base_events', 'asyncio.runners', 'asyncio.queues', 'asyncio.streams', 'asyncio.subprocess', 'asyncio.threads', '_overlapped', 'asyncio.base_subprocess', 'asyncio.proactor_events', 'asyncio.selector_events', 'asyncio.windows_utils', 'asyncio.windows_events', 'asyncio', 'unittest.mock', 'styleframe.command_line.tests.commandline_tests', 'styleframe.tests.container_tests', 'styleframe.tests.series_tests', 'styleframe.tests.style_frame_tests', 'styleframe.tests.styler_tests', 'styleframe.tests.tests', 'styleframe', 'encodings.ascii', 'pandas.io.formats.string', 'xlsxwriter.xmlwriter', 'xlsxwriter.format', 'xlsxwriter.shape', 'xlsxwriter.utility', 'xlsxwriter.drawing', 'xlsxwriter.exceptions', 'xlsxwriter.worksheet', 'xlsxwriter.chartsheet', 'xlsxwriter.sharedstrings', 'xlsxwriter.app', 'xlsxwriter.contenttypes', 'xlsxwriter.core', 'xlsxwriter.custom', 'xlsxwriter.metadata', 'xlsxwriter.relationships', 'xlsxwriter.styles', 'xlsxwriter.theme', 'xlsxwriter.vml', 'xlsxwriter.table', 'xlsxwriter.comments', 'xlsxwriter.packager', 'xlsxwriter.chart', 'xlsxwriter.chart_area', 'xlsxwriter.chart_bar', 'xlsxwriter.chart_column', 'xlsxwriter.chart_pie', 'xlsxwriter.chart_doughnut', 'xlsxwriter.chart_line', 'xlsxwriter.chart_radar', 'xlsxwriter.chart_scatter', 'xlsxwriter.chart_stock', 'xlsxwriter.workbook', 'xlsxwriter', 'pip', '_distutils_hack', '_distutils_hack.override', 'distutils', 'distutils.debug', 'distutils.errors', 'getopt', 'distutils.fancy_getopt', 'distutils.dep_util', 'distutils.log', 'distutils.spawn', 'distutils.util', 'distutils.dist', 'distutils.dir_util', 'distutils.file_util', 'distutils.archive_util', 'distutils.cmd', 'distutils.config', 'distutils.extension', 'distutils.core', 'setuptools._deprecation_warning', 'plistlib', 'pkg_resources.extern', 'pkg_resources._vendor', 'pkg_resources._vendor.appdirs', 'pkg_resources.extern.appdirs', 'pkg_resources._vendor.packaging.__about__', 'pkg_resources._vendor.packaging', 'pkg_resources.extern.packaging', 'pkg_resources.extern.packaging._structures', 'pkg_resources.extern.packaging._typing', 'pkg_resources.extern.packaging.version', 'pkg_resources.extern.packaging._compat', 'pkg_resources.extern.packaging.utils', 'pkg_resources.extern.packaging.specifiers', 'pkg_resources._vendor.pyparsing', 'pkg_resources.extern.pyparsing', 'pkg_resources.extern.packaging.markers', 'pkg_resources.extern.packaging.requirements', 'pkg_resources', 'setuptools.version', 'distutils.filelist', 'setuptools.monkey', 'setuptools.extension', 'distutils.command', 'distutils.version', 'setuptools.extern', 'setuptools._vendor', 'setuptools._vendor.packaging.__about__', 'setuptools._vendor.packaging', 'setuptools.extern.packaging', 'setuptools._vendor.ordered_set', 'setuptools.extern.ordered_set', 'concurrent.futures.thread', 'setuptools._vendor.more_itertools.recipes', 'setuptools._vendor.more_itertools.more', 'setuptools._vendor.more_itertools', 'setuptools.extern.more_itertools', 'distutils.command.bdist', 'setuptools.command', 'setuptools.windows_support', 'setuptools.extern.packaging._structures', 'setuptools.extern.packaging._typing', 'setuptools.extern.packaging.version', 'setuptools.extern.packaging._compat', 'setuptools.extern.packaging.utils', 'setuptools.extern.packaging.specifiers', 'setuptools.config', 'setuptools.dist', 'setuptools.py34compat', 'setuptools._imp', 'setuptools.depends', 'distutils.ccompiler', 'distutils.msvc9compiler', 'setuptools.msvc', 'distutils._msvccompiler', 'setuptools', '_pytest._version', '_pytest', 'pluggy._version', 'pluggy._tracing', 'pluggy._result', 'pluggy._callers', 'pluggy._hooks', 'pluggy._manager', 'pluggy', '_pytest._code.source', '_pytest._io.wcwidth', 'py.error', 'py._error', 'py._vendored_packages', 'py._vendored_packages.apipkg.version', 'py._vendored_packages.apipkg', 'py._version', 'py.test', 'py.process', 'py.apipkg', 'py.iniconfig', 'py.path', 'py.code', 'py.builtin', 'py.io', 'py.xml', 'py.log', 'py', 'py._path', 'py._path.common', 'py._path.local', '_pytest.compat', '_pytest._io.terminalwriter', '_pytest._io', '_pytest._io.saferepr', '_pytest.warning_types', '_pytest.deprecated', '_pytest.outcomes', '_pytest.pathlib', '_pytest._code.code', '_pytest._code', 'shlex', '_pytest.hookspec', '_pytest.config.exceptions', 'iniconfig', '_pytest.config.findpaths', '_pytest.stash', '_pytest.config', '_pytest.assertion.util', '_pytest.mark.expression', '_pytest.mark.structures', '_pytest.config.argparsing', '_pytest.mark', '_pytest.nodes', '_pytest.scope', '_pytest.fixtures', '_pytest.reports', 'bdb', '_pytest.timing', '_pytest.runner', '_pytest.main', 'atomicwrites', '_pytest.assertion.rewrite', '_pytest.assertion.truncate', '_pytest.assertion', '_pytest.python', '_pytest.cacheprovider', '_pytest.capture', '_pytest.debugging', '_pytest.freeze_support', '_pytest.monkeypatch', '_pytest.tmpdir', '_pytest.pytester', '_pytest.terminal', '_pytest.legacypath', '_pytest.logging', '_pytest.python_api', '_pytest.recwarn', 'pytest', 'six.moves.urllib', 'webencodings.labels', 'encodings.utf_16_le', 'encodings.utf_16_be', 'webencodings', 'html5lib.constants', 'html5lib._utils', 'html5lib._inputstream', 'html5lib._trie._base', 'html5lib._trie.py', 'html5lib._trie', 'html5lib._tokenizer', 'html5lib.treebuilders', 'html5lib.treebuilders.base', 'html5lib.html5parser', 'html5lib.treewalkers', 'xml.sax.handler', 'xml.sax._exceptions', 'xml.sax.xmlreader', 'xml.sax', 'xml.sax.saxutils', 'html5lib.serializer', 'html5lib', 'jinja2.bccache', 'markupsafe._speedups', 'markupsafe', 'jinja2.utils', 'jinja2.nodes', 'jinja2.exceptions', 'jinja2.visitor', 'jinja2.idtracking', 'jinja2.optimizer', 'jinja2.compiler', 'jinja2.async_utils', 'jinja2.runtime', 'jinja2.filters', 'jinja2.tests', 'jinja2.defaults', 'jinja2._identifier', 'jinja2.lexer', 'jinja2.parser', 'jinja2.environment', 'jinja2.loaders', 'jinja2', 'soupsieve.__meta__', 'soupsieve.util', 'soupsieve.pretty', 'soupsieve.css_types', 'soupsieve.css_match', 'soupsieve.css_parser', 'soupsieve', 'html.entities', 'html', 'bs4.dammit', 'bs4.formatter', 'bs4.element', '_markupbase', 'html.parser', 'bs4.builder._htmlparser', 'bs4.builder._html5lib', 'bs4.builder', 'bs4', 'matplotlib', 'packaging.__about__', 'packaging', 'packaging._structures', 'packaging.version', 'matplotlib._api.deprecation', 'matplotlib._api', 'matplotlib._version', 'matplotlib._c_internal_utils', 'matplotlib.cbook', 'matplotlib.docstring', 'PIL.ImageChops', 'PIL.ImageFile', 'PIL.GimpGradientFile', 'PIL.GimpPaletteFile', 'PIL.ImageColor', 'PIL.PaletteFile', 'PIL.ImagePalette', 'PIL.ImageSequence', 'PIL.PngImagePlugin', 'matplotlib._path', 'matplotlib.bezier', 'matplotlib.path', 'matplotlib.transforms', 'matplotlib.ticker', 'matplotlib.scale', 'matplotlib._color_data', 'matplotlib.colors', 'pyparsing.util', 'pyparsing.unicode', 'pyparsing.exceptions', 'pyparsing.actions', 'pyparsing.results', 'pyparsing.core', 'pyparsing.helpers', 'pyparsing.testing', 'pyparsing.common', 'pyparsing', 'matplotlib.fontconfig_pattern', 'matplotlib._enums', 'cycler', 'matplotlib.rcsetup', 'matplotlib.ft2font', 'kiwisolver']

INSTALLED VERSIONS
------------------
commit           : f00ed8f47020034e752baf0250483053340971b0
python           : 3.9.10.final.0
python-bits      : 64
OS               : Windows
OS-release       : 10
Version          : 10.0.19043
machine          : AMD64
processor        : Intel64 Family 6 Model 140 Stepping 1, GenuineIntel
byteorder        : little
LC_ALL           : None
LANG             : None
LOCALE           : de_DE.cp1252

pandas           : 1.3.0
numpy            : 1.22.1
pytz             : 2021.3
dateutil         : 2.8.2
pip              : 22.1.2
setuptools       : 58.1.0
Cython           : None
pytest           : 7.1.2
hypothesis       : None
sphinx           : None
blosc            : None
feather          : None
xlsxwriter       : 3.0.2
lxml.etree       : None
html5lib         : 1.1
pymysql          : None
psycopg2         : None
jinja2           : 3.0.3
IPython          : None
pandas_datareader: None
bs4              : 4.10.0
bottleneck       : None
fsspec           : None
fastparquet      : None
gcsfs            : None
matplotlib       : 3.5.1
numexpr          : None
odfpy            : None
openpyxl         : 3.0.9
pandas_gbq       : None
pyarrow          : 8.0.0
pyxlsb           : None
s3fs             : None
scipy            : 1.8.1
sqlalchemy       : None
tables           : None
tabulate         : 0.8.9
xarray           : None
xlrd             : 2.0.1
xlwt             : None
numba            : None

pandas-dev / pandas