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Net Income Per Share (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Numerator (basic and diluted):    
Net income $ 13.7 $ 21.1
Less: Dividends paid to participating securities (0.1) (0.1)
Less: Undistributed earnings available to participating securities 0.0 0.0
Undistributed and distributed earnings available to common stockholders $ 13.6 $ 21.0
Denominator:    
Average number of common shares outstanding (in shares) 30,364,700 30,294,900
Effect of dilutive stock-based compensation (in shares) 122,600 127,800
Average number of common and potential common shares outstanding (in shares) 30,487,300 30,422,700