Income Taxes - Schedule of components of income tax expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Current:
Federal	$ 1,429.8	$ 199.0	$ 444.6
State	6.2	1.2	1.9
Foreign	(38.4)	21.4	(2.6)
Total current tax expense	1,397.6	221.6	443.9
Deferred:
Federal	(423.2)	109.0	(132.0)
State	(0.6)	(2.0)	(1.7)
Foreign	276.7	(31.4)	3.1
Total deferred tax (benefit) expense	(147.1)	75.6	(130.6)
Total income tax expense (benefit)	$ 1,250.5	$ 297.2	$ 313.3