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Net Income Per Share (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Numerator (basic and diluted):        
Net income $ 11.8 $ 1.8 $ 13.4 $ 23.4
Less: Dividends paid to participating securities (0.3) (0.2) (0.5) (0.3)
Less: Undistributed earnings available to participating securities, basic 0.0 0.1 0.0 0.0
Less: Undistributed earnings available to participating securities, diluted 0.0 0.1 0.0 0.0
Undistributed and distributed earnings available to common stockholders, basic 11.5 1.7 12.9 23.1
Undistributed and distributed earnings available to common stockholders, diluted $ 11.5 $ 1.7 $ 12.9 $ 23.1
Denominator:        
Average number of common shares outstanding (in shares) 31,260,100 31,045,100 31,209,300 31,009,900
Effect of dilutive stock-based compensation (in shares) 149,700 357,300 202,700 361,800
Average number of common and potential common shares outstanding (in shares) 31,409,800 31,402,400 31,412,000 31,371,700