Income Taxes (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Current:
Federal	$ 71.9	$ 47.5	$ 41.4
State	8.5	7.3	5.3
Foreign	16.2	13.4	7.3
Total current	96.6	68.2	54.0
Deferred:
Federal	(4.0)	0.7	0.4
State	2.5	(0.2)	(1.0)
Foreign	(0.7)	(2.0)	2.4
Deferred Income Tax Expense (Benefit)	(2.2)	(1.5)	1.8
Total income tax provision	$ 94.4	$ 66.7	$ 55.8