Goodwill and Other Intangible Assets - Schedule of Intangible Assets and Goodwill (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Indefinite-Lived Intangible Assets [Line Items]
Intangible assets, gross (excluding goodwill)	$ 470.3	$ 849.3
Accumulated Amortization	(46.1)	(23.4)
Intangible assets, net (excluding goodwill), total	424.2	825.9
Marketed Products
Indefinite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross	238.0	238.0	$ 238.0
Accumulated Amortization	(42.1)	(21.9)
Finite-lived intangible assets, net, total	$ 195.9	216.1
Assembled Workforce
Indefinite-Lived Intangible Assets [Line Items]
Estimated Useful lives	3 years
Finite-lived intangible assets, gross	$ 7.7	7.7
Accumulated Amortization	(4.0)	(1.5)
Finite-lived intangible assets, net, total	$ 3.7	6.2
Minimum | Marketed Products
Indefinite-Lived Intangible Assets [Line Items]
Estimated Useful lives	10 years
Maximum | Marketed Products
Indefinite-Lived Intangible Assets [Line Items]
Estimated Useful lives	12 years
In-process research and development
Indefinite-Lived Intangible Assets [Line Items]
Indefinite-lived intangible assets (excluding goodwill)	$ 224.6	$ 603.6