Income Taxes Components of Income Tax Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income before income taxes:
United States	$ 349.5	$ 347.2	$ 385.6
International	80.9	71.4	99.9
Income before income taxes	430.4	418.6	485.5
Provision for income taxes — current:
Federal	85.5	110.4	90.1
State	17.4	13.7	15.4
International	17.0	17.6	22.5
Total provision-current	119.9	141.7	128.0
Provision for income taxes — deferred:
Federal	13.5	(1.7)	24.4
State	1.3	0.4	2.7
International	(2.1)	(3.9)	3.2
Total provision — deferred	12.7	(5.2)	30.3
TOTAL PROVISION FOR INCOME TAXES	$ 132.6	$ 136.5	$ 158.3