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Net Income Per Share (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Numerator (basic and diluted):        
Net income $ 23.4 $ 25.0 $ 42.2 $ 48.2
Less: Dividends paid to participating securities 0.0 (0.1) (0.2) (0.2)
Less: Undistributed earnings available to participating securities (0.3) (0.2) (0.3) (0.3)
Undistributed and distributed earnings available to common stockholders $ 23.1 $ 24.7 $ 41.7 $ 47.7
Denominator:        
Average number of common shares outstanding (in shares) 30,274,300 30,096,500 30,226,600 30,379,700
Effect of dilutive stock-based compensation (in shares) 122,700 114,200 118,800 113,200
Average number of common and potential common shares outstanding (in shares) 30,397,000 30,210,700 30,345,400 30,492,900