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Acquisitions (Narrative) (Details) $ / shares in Units, $ in Millions	1 Months Ended			3 Months Ended				6 Months Ended
	Jul. 31, 2021 USD ($)	Jan. 31, 2021 USD ($) right $ / shares	Feb. 29, 2020 USD ($)	Sep. 30, 2021 USD ($)	Jun. 30, 2021 USD ($)	Mar. 31, 2021 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Business Acquisition [Line Items]
Acquired IPR&D Expense					$ 25.0		$ 241.8	$ 324.3	$ 294.1
Cash paid, net of cash acquired								747.4	849.3
Goodwill					$ 3,884.2			3,884.2		$ 3,766.5
Repayments of long-term debt								$ 0.0	$ 276.3
Kumquat Biosciences Inc. | Subsequent Event
Business Acquisition [Line Items]
Payments to acquire businesses	$ 50.0
Consideration transferred, equity interests purchased	20.0
Kumquat Biosciences Inc. | Subsequent Event | Forecast
Business Acquisition [Line Items]
Acquired IPR&D Expense				$ 55.0
Prevail Therapeutics Inc.
Business Acquisition [Line Items]
Business acquisition, share price (in dollars per share) | $ / shares		$ 22.50
Cash paid, net of cash acquired		$ 747.4
Consideration transferred, number of contingent value rights | right		1
Contingent value right, additional price per share (up to) (in dollars per share) | $ / shares		$ 4.00
Contingent value right, additional price per share, aggregate amount		$ 160.0
Contingent value right, monthly reduction (in cents per share) | $ / shares		$ 0.083
Goodwill		$ 118.8
Acquired IPR&D		824.0
Deferred income taxes assumed		$ 98.0
Dermira
Business Acquisition [Line Items]
Purchase price			$ 849.3
Goodwill			86.8
Acquired IPR&D			1,200.0
Deferred income taxes assumed			49.5
Long-term debt assumed			$ 375.5
Repayments of long-term debt						$ 276.2
Protomer Technologies Inc. | Subsequent Event
Business Acquisition [Line Items]
Payments to acquire businesses	$ 61.6
Protomer Technologies Inc. | Subsequent Event | Forecast
Business Acquisition [Line Items]
Acquired IPR&D Expense				$ 65.0

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