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Income Taxes (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Income Tax Disclosure [Abstract]      
Effective tax rate (in hundredths) 22.00% 26.10%  
Discrete tax charge, other adj   $ 0.3  
Estimated reduction of unrecognized tax benefits 2.0    
Accrued interest and penalties 0.5   0.5
Discrete tax benefit, R&D credit $ 1.3