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Net Income Per Share (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Numerator (basic and diluted):        
Net income $ 26.0 $ 23.4 $ 47.1 $ 42.2
Less: Dividends paid to participating securities 0.0 0.0 (0.1) (0.2)
Less: Undistributed earnings available to participating securities (0.2) (0.3) (0.2) (0.3)
Undistributed and distributed earnings available to common stockholders $ 25.8 $ 23.1 $ 46.8 $ 41.7
Denominator:        
Average number of common shares outstanding (in shares) 30,313,200 30,274,300 30,304,100 30,226,600
Effect of dilutive stock-based compensation (in shares) 134,500 122,700 131,100 118,800
Average number of common and potential common shares outstanding (in shares) 30,447,700 30,397,000 30,435,200 30,345,400
Anti-dilutive stock options (in shares)   0