Income Taxes (Details 2) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Federal:
Current	$ 14.0	$ 5.2	$ 7.4
Deferred	0.8	6.4	2.1
State:
Current	2.8	2.9	2.4
Deferred	(1.9)	0.4	0
Foreign:
Current	8.4	8.0	7.4
Deferred	(0.8)	(2.1)	1.0
Income tax expense (benefit), total	$ 23.3	$ 20.8	$ 20.3