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Net Income Per Share (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Numerator (basic and diluted):        
Net income $ 24.5 $ 27.7 $ 68.5 $ 65.6
Less: Dividends paid to participating securities (0.1) 0.0 (0.5) (0.2)
Less: Undistributed earnings available to participating securities (0.2) (0.1) (0.4) (0.2)
Undistributed and distributed earnings available to common stockholders $ 24.2 $ 27.6 $ 67.6 $ 65.2
Denominator:        
Average number of common shares outstanding (in shares) 30,909,700 30,662,800 30,805,300 30,648,400
Effect of dilutive stock-based compensation (in shares) 232,800 169,100 214,800 156,300
Average number of common and potential common shares outstanding (in shares) 31,142,500 30,831,900 31,020,100 30,804,700