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Divestitures (Details) - USD ($) $ in Millions		3 Months Ended			12 Months Ended
Divestitures (Details) - USD ($) $ in Millions	Nov. 29, 2022	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022	Dec. 31, 2024
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Assets held for sale		$ 198.3	$ 230.3
Other Nonoperating Income (Expense)		69.9		$ (33.7)
Licensing Agreements
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Write down of intangible assets		32.0	172.9
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			374.2
Inventory Valuation Reserves			9.2
Loss Contingency, Asset Impairment, Disposal Transactions Not Completed In Current Fiscal Year		250.0
Assets held for sale		198.3
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 (2)
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)		$ 45.7
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
Noncash or Part Noncash Divestiture, Amount of Consideration Received	$ 1,000.0
Disposal Group, Including Discontinued Operation, Ownership Percentage in Disposed Asset	12.90%
Disposal Group, Including Discontinued Operation, Transition Services Agreement, Revised Term	2 years
Disposal Group, Including Discontinued Operations, Contingent Consideration Liability, Working Capital Adjustment	$ 250.0