Basis of Presentation and Summary of Significant Accounting Policies - Cobra (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Mar. 31, 2024
Business Combination [Line Items]
Net income (loss) including noncontrolling interests	$ (2,936.9)	$ 228.8	$ (2,389.5)	$ 864.0
Interest expense	$ 56.0	93.1	$ 171.1	$ 192.7
Scenario, Adjustment
Business Combination [Line Items]
Net income (loss) including noncontrolling interests		34.5
Interest expense		$ 45.8
Cobra U.K.
Business Combination [Line Items]
Interest acquired					49.90%