Income Taxes (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Current:
Federal	$ 20.0	$ (22.2)	$ 5.8
State	5.5	(2.0)	0.7
Foreign	5.4	5.0	7.9
Total current	30.9	(19.2)	14.4
Deferred:
Federal	62.7	57.0	(27.1)
State	1.2	3.4	(3.5)
Foreign	(3.0)	(0.3)	6.8
Total deferred	60.9	60.1	(23.8)
Provision for income taxes	$ 91.8	$ 40.9	$ (9.4)