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Divestitures (Details) - USD ($) $ in Millions		3 Months Ended				6 Months Ended		12 Months Ended
Divestitures (Details) - USD ($) $ in Millions	Nov. 29, 2022	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2024
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Assets held for sale		$ 174.9		$ 230.3		$ 174.9
Other Nonoperating Income (Expense)		107.5			$ (13.5)	177.4	$ (47.2)
Biocon Biologics
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Equity Securities, FV-NI, Gain (Loss)		28.9
Licensing Agreements
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Write down of intangible assets				172.9		32.0
Upjohn Distributor Markets \| Disposal Group, Held-for-Sale, Not Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Asset Impairment Charges			$ 10.0	374.2
Inventory Valuation Reserves				19.2
Loss Contingency, Asset Impairment, Disposal Transactions Not Completed In Current Fiscal Year		250.0				250.0
Upjohn Distributor Markets \| Disposal Group, Held-for-Sale, Not Discontinued Operations \| Inventories
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Asset Impairment Charges				84.3
Upjohn Distributor Markets \| Disposal Group, Held-for-Sale, Not Discontinued Operations \| Emerging Markets Segment
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Goodwill, Impairment Loss				$ 117.0
Biocon Biologics
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Other Nonoperating Income (Expense)		$ 46.9				92.6
Biocon Biologics \| Scenario, Forecast \| Collaborative Arrangement, Transaction with Party to Collaborative Arrangement
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Divestiture of Business, Deferred Cash Consideration.								$ 335.0
Biocon Biologics \| Disposal Group, Disposed of by Sale, Not Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Consideration	$ 3,000.0
Proceeds from Divestiture of Businesses	$ 2,000.0
Disposal Group, Including Discontinued Operation, Ownership Percentage in Disposed Asset	12.90%
Disposal Group, Including Discontinued Operations, Contingent Consideration Liability, Working Capital Adjustment	$ 250.0
Disposal Group, Including Discontinued Operation, Transition Services Agreement, Markup Value						$ 44.0
Noncash or Part Noncash Divestiture, Amount of Consideration Received	$ 1,000.0