Income Taxes - Components of United States and Foreign Tax (Benefit) Expense (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Current:
Federal	$ 315.0	$ 1.0	$ (5.0)	$ 0.0
Foreign		166.0	95.0	134.0
State		37.0	(3.0)	17.0
Current income tax expense (benefit)		204.0	87.0	151.0
Deferred:
Federal		(362.0)	63.0	133.0
Foreign		(23.0)	(31.0)	153.0
State		(86.0)	(9.0)	37.0
Deferred income tax expense (benefit)		(471.0)	23.0	323.0
United States and Foreign Tax Expense (Benefit)	$ 1.5	$ (267.0)	$ 110.0	$ 474.0