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Net Income Per Share (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Numerator (basic and diluted):        
Net income $ 22.3 $ 26.0 $ 36.0 $ 47.1
Less: Dividends paid to participating securities (0.1) 0.0 (0.2) (0.1)
Less: Undistributed earnings available to participating securities (0.1) (0.2) (0.1) (0.2)
Undistributed and distributed earnings available to common stockholders $ 22.1 $ 25.8 $ 35.7 $ 46.8
Denominator:        
Average number of common shares outstanding (in shares) 30,412,900 30,313,200 30,389,000 30,304,100
Effect of dilutive stock-based compensation (in shares) 133,800 134,500 128,100 131,100
Average number of common and potential common shares outstanding (in shares) 30,546,700 30,447,700 30,517,100 30,435,200