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Net Income Per Share (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Numerator (basic and diluted):        
Net income $ 12.2 $ 24.5 $ 35.6 $ 68.5
Less: Dividends paid to participating securities (0.2) (0.1) (0.5) (0.5)
Less: Undistributed earnings available to participating securities, basic 0.0 (0.2) 0.0 (0.4)
Less: Undistributed earnings available to participating securities, diluted 0.0 (0.2) 0.0 (0.4)
Undistributed and distributed earnings available to common stockholders, basic 12.0 24.2 35.1 67.6
Undistributed and distributed earnings available to common stockholders, diluted $ 12.0 $ 24.2 $ 35.1 $ 67.6
Denominator:        
Average number of common shares outstanding (in shares) 31,046,100 30,909,700 31,022,100 30,805,300
Effect of dilutive stock-based compensation (in shares) 354,900 232,800 359,500 214,800
Average number of common and potential common shares outstanding (in shares) 31,401,000 31,142,500 31,381,600 31,020,100