Income Taxes - Components of Provision For Income Taxes (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Federal [Abstract]
Current	$ 10.4	$ 14.0	$ 5.7
Deferred	1.2	0.8	5.9
State [Abstract]
Current	1.2	2.8	3.0
Deferred	(0.2)	(1.9)	0.3
Foreign [Abstract]
Current	6.4	8.4	8.0
Deferred	(8.0)	(0.8)	(2.1)
Income tax expense (benefit), total	$ 11.0	$ 23.3	$ 20.8