Schedule of U.S. Federal, State and Foreign Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
U.S. federal	$ 161.4	$ 159.0	$ 151.7
State, Current	25.5	24.4	24.7
Foreign, Current	14.1	14.9	15.9
Current income tax expense (benefit)	201.0	198.3	192.3
U.S. federal, Deferred	22.8	11.5	12.6
State, Deferred	3.3	1.1	(1.7)
Foreign, Deferred	(2.1)	0.1	0.2
Deferred income tax expense (benefit)	24.0	12.7	11.1
Recorded tax expense	$ 225.0	$ 211.0	$ 203.4