Intangible Assets and Goodwill - Summary of Intangible Assets (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Finite-Lived Intangible Assets, Net [Abstract]
Finite-Lived Intangible Assets, Gross	$ 14,103.6	$ 14,138.4
Accumulated Amortization	(6,325.9)	(6,254.1)
Net	7,777.7	7,884.3
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Cost	15,910.5	15,945.3
Accumulated Amortization	6,325.9	6,254.1
Net	$ 9,584.6	9,691.2
Minimum
Finite-Lived Intangible Assets [Line Items]
Estimated life (in years)	2 years
Maximum
Finite-Lived Intangible Assets [Line Items]
Estimated life (in years)	31 years
In-process research and development
Indefinite-Lived Intangible Assets [Line Items]
Cost and net	$ 1,642.9	1,642.9
Priority review voucher
Indefinite-Lived Intangible Assets [Line Items]
Cost and net	100.0	100.0
Trademarks and trade names
Indefinite-Lived Intangible Assets [Line Items]
Cost and net	$ 64.0	$ 64.0