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Acquisitions (Narrative) (Details) $ / shares in Units, $ in Millions		1 Months Ended		3 Months Ended		9 Months Ended
	Dec. 01, 2022 USD ($)	Oct. 31, 2023 USD ($) $ / shares	Dec. 31, 2022 USD ($) right $ / shares	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)
Business Acquisition [Line Items]
Acquired in-process research and development (Note 3)				$ 2,975.1	$ 62.4	$ 3,177.2	$ 668.4
Acquired IPR&D Expense							$ 333.8
Akouos Acquisition
Business Acquisition [Line Items]
Business acquisition, share price (in dollars per share) | $ / shares			$ 12.50
Cash paid, net of cash acquired	$ 327.2		$ 327.2
Consideration transferred, number of contingent value rights | right			1
Contingent value right, additional price per share (up to) (in dollars per share) | $ / shares			$ 3.00
Contingent value right, additional price per share, aggregate amount			$ 122.0
Biopharma Global Inc | Subsequent Event
Business Acquisition [Line Items]
Business acquisition, share price (in dollars per share) | $ / shares		$ 12.50
Payments to acquire businesses		$ 1,400.0

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