Schedule of U.S. Federal, State and Foreign Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
U.S. federal	$ 103.4	$ 146.7	$ 183.4
State, Current	23.4	29.0	27.2
Foreign, Current	13.0	11.2	11.4
Current income tax expense (benefit)	139.8	186.9	222.0
U.S. federal, Deferred	5.4	(235.0)	19.2
State, Deferred	4.6	3.8	4.1
Foreign, Deferred	1.1	(6.4)	1.6
Deferred income tax expense (benefit)	11.1	(237.6)	24.9
Recorded tax expense	$ 150.9	$ (50.7)	$ 246.9