Income Taxes (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Current:
Federal	$ 27.7	$ 54.7	$ 17.5
State	2.8	6.0	5.0
Foreign	8.8	7.3	8.1
Total current	39.3	68.0	30.6
Deferred:
Federal	0.9	(6.9)	9.9
State	(0.5)	(1.6)	3.0
Foreign	2.6		(4.4)
Total deferred	3.0	(8.5)	8.5
Total income tax provision	$ 42.3	$ 59.5	$ 39.1