Acquisitions and Other Transactions (Purchase Price Allocations) (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2023	Dec. 31, 2022	Nov. 07, 2022
Business Acquisition [Line Items]
Goodwill	$ 10,278.1	$ 10,278.1	$ 10,425.8
Oyster Point Pharma Acquisition
Business Acquisition [Line Items]
Current assets (excluding inventories and net of cash acquired)	26.9	26.9
Inventories	37.8	37.8
Property, plant and equipment	1.4	1.4
Goodwill	5.9	5.9
Deferred income tax benefit	17.7	17.7
Other assets	7.7	7.7
Total assets acquired	431.4	431.4
Current liabilities	(37.0)	(37.0)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other	1.7	1.7
Payments to Acquire Businesses, Net of Cash Acquired	392.7	392.7
Business Acquisition, Provisional Information, Initial Accounting Incomplete, Adjustment, Amortization	7.3	22.0
Oyster Point Pharma Acquisition | Product Rights And Licenses
Business Acquisition [Line Items]
Acquired intangible assets	$ 334.0	$ 334.0
Famy Life Sciences Acquisition
Business Acquisition [Line Items]
Goodwill				$ 89.3
Total assets acquired				379.3
Current liabilities				(2.2)
Deferred tax liabilities				52.1
Payments to Acquire Businesses, Net of Cash Acquired				$ 325.0