Income Taxes (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Current:
Federal	$ 141.8	$ (5.7)	$ 20.8
State	13.7	7.0	5.5
Foreign	3.1	6.4	5.4
Total current	158.6	7.7	31.7
Deferred:
Federal	44.3	126.6	62.2
State	2.3	3.2	1.3
Foreign	(0.8)	(3.5)	(3.0)
Total deferred	45.8	126.3	60.5
Provision	$ 204.4	$ 134.0	$ 92.2