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Income Tax Expense - Gross Unrecognized Income Tax Benefits (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Reconciliation of Gross Unrecognized Income Tax Benefits [Roll Forward]      
Balance at January 1 $ 11.4 $ 12.3 $ 9.5
Reductions for Tax Positions Related to the Current Year 0 0 (0.2)
Additions for Tax Positions Related to Prior Years 0 0 4.4
Reduction for Tax Positions Related to Prior Years (8.7) (0.9) 0
Reductions for Settlements 0 0 (0.3)
Reductions for Expired Statute of Limitations 0 0 (1.1)
Balance as of December 31 2.7 11.4 12.3
Unrecognized Tax Benefits that Would Impact Effective Tax Rate 0.5    
Unrecognized Tax Benefits, Accrued Interest 0.5 1.1 0.7
Unrecognized Tax Benefits, Penalties 0 0 0
Unrecognized Tax Benefits, Interest Expense (Reduction) (0.6) 0.4 (0.2)
Reasonably Possible Change in Unrecognized Tax Benefits in Next 12 Months $ 2.5