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Net Income Per Share (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Numerator (basic and diluted):        
Net income $ 18.7 $ 25.8 $ 65.8 $ 68.0
Less: Dividends paid to participating securities (0.1) 0.0 (0.2) (0.2)
Less: Undistributed earnings available to participating securities 0.0 0.0 (0.2) (0.2)
Undistributed and distributed earnings available to common stockholders $ 18.6 $ 25.8 $ 65.4 $ 67.6
Denominator:        
Average number of common shares outstanding (in shares) 30,316,400 30,275,400 30,308,200 30,243,000
Effect of dilutive stock-based compensation (in shares) 142,400 133,200 134,900 123,600
Average number of common and potential common shares outstanding (in shares) 30,458,800 30,408,600 30,443,100 30,366,600