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Income Taxes - Reconciliation of Unrecognized Tax Benefits (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Balance at Beginning of Year $ 6.4 $ 6.2 $ 7.8
Reductions for Tax Positions of Current Period 0.1 0 (1.8)
Additions for Tax Positions of Prior Years 0.3 0.2 0.2
Balance at End of Year 6.8 6.4 6.2
Unrecognized Tax Benefit that Would Not Impact Effective Tax Rate, Tax Position with Uncertain Timing of Deductibility 3.4 3.5 3.7
Unrecognized Tax Benefits, Interest on Income Taxes Accrued 3.4 2.9 2.5
Unrecognized Tax Benefits, Interest on Income Taxes Expense $ 0.4 $ (0.4) $ (0.4)