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Net Income Per Share (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Net Income Per Share [Abstract]    
Net income $ 23.2 $ 30.1
Less: Dividends paid to participating securities (0.1) (0.1)
Less: Undistributed earnings available to participating securities (0.1) (0.2)
Undistributed and distributed earnings available to common shareholders $ 23.0 $ 29.8
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]    
Average number of common shares outstanding 30,665,900 30,945,600
Effect of dilutive stock-based compensation 112,300 163,300
Average number of common and potential common shares outstanding 30,778,200 31,108,900