Income Taxes - Schedule Of Provision For Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Current income taxes, Federal	$ 82.0	$ 89.5	$ 352.1
Current income taxes, State	26.5	21.1	13.0
Current income taxes, Foreign	18.0	9.9	8.7
Current income taxes	126.5	120.5	373.8
Deferred income taxes, Federal	8.5	(4.1)	62.8
Deferred income taxes, State	3.2	(0.3)	(0.3)
Deferred income taxes, Foreign	(17.8)	38.4	(2.4)
Deferred income taxes	(6.1)	34.0	60.1
Total income tax expense	$ 120.4	$ 154.5	$ 433.9