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Income Tax Expense - Gross Unrecognized Income Tax Benefits (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Gross Unrecognized Income Tax Benefits [Abstract]      
Unrecognized Tax Benefits that Would Impact Effective Tax Rate $ 0.6    
Accrued Interest 1.1 0.7 0.9
Interest Expense 0.4 0.2 0.4
Penalties 0    
Reasonably Possible Change in Unrecognized Tax Benefits in Next 12 Months 5.0    
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Balance at January 1 12.3 9.5 8.0
Additions for Tax Positions Related to the Current Year 0 0 0.5
Reductions for Tax Positions Related to the Current Year 0 (0.2) 0
Additions for Tax Positions Related to Prior Years 0 4.4 1.0
Reduction for Tax Positions Related to Prior Years (0.9) 0 0
Settlements 0 (0.3) 0
Lapse of Statute 0 (1.1) 0
Balance as of December 31 $ 11.4 $ 12.3 $ 9.5