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Net Income Per Share (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Numerator (basic and diluted):        
Net income $ 25.8 $ 18.7 $ 61.8 $ 65.8
Less: Dividends paid to participating securities (0.1) (0.1) (0.3) (0.2)
Less: Undistributed earnings available to participating securities (0.1) 0.0 (0.2) (0.2)
Undistributed and distributed earnings available to common stockholders $ 25.6 $ 18.6 $ 61.3 $ 65.4
Denominator:        
Average number of common shares outstanding (in shares) 30,422,800 30,316,400 30,400,400 30,308,200
Effect of dilutive stock-based compensation (in shares) 146,700 142,400 134,300 134,900
Average number of common and potential common shares outstanding (in shares) 30,569,500 30,458,800 30,534,700 30,443,100