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Acquisitions and Other Transactions (Purchase Price Allocations) (Details) - USD ($) $ in Millions	Mar. 31, 2024	Mar. 15, 2024	Dec. 31, 2023	Nov. 07, 2022
Business Acquisition [Line Items]
Goodwill	$ 9,693.5		$ 9,867.1
Famy Life Sciences Acquisition
Business Acquisition [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired				$ 695.0
Idorsia Pharmaceuticals Ltd.
Business Acquisition [Line Items]
Current assets (excluding inventories and net of cash acquired)		$ 2.1
Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, In Process Research And Development		675.0
Goodwill		19.5
Total assets acquired		696.6
Current liabilities		(1.6)
Payments to Acquire Businesses, Net of Cash Acquired		$ 695.0