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Income Taxes (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Income Tax Disclosure [Abstract]    
Deferred Tax Assets, Net $ 16.2 $ 16.5
Unrecognized Tax Benefits, Period Increase (Decrease) 0  
Unrecognized Tax Benefits 3.0  
Unrecognized Tax Benefits, Interest on Income Taxes Accrued 0.4  
Unrecognized Tax Benefits, Income Tax Penalties Accrued $ 0.3