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Net Income Per Share (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Numerator (basic and diluted):        
Net income $ 25.8 $ 23.0 $ 68.0 $ 71.2
Less: Dividends paid to participating securities 0.0 (0.1) (0.2) (0.3)
Less: Undistributed earnings available to participating securities 0.0 (0.1) (0.2) (0.4)
Undistributed and distributed earnings available to common stockholders $ 25.8 $ 22.8 $ 67.6 $ 70.5
Denominator:        
Average number of common shares outstanding (in shares) 30,275,400 30,098,300 30,243,000 30,284,900
Effect of dilutive stock-based compensation (in shares) 133,200 127,200 123,600 117,800
Average number of common and potential common shares outstanding (in shares) 30,408,600 30,225,500 30,366,600 30,402,700