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Net Income Per Share (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Numerator (basic and diluted):    
Net income $ 1.6 $ 21.6
Less: Dividends paid to participating securities (0.2) (0.1)
Less: Undistributed earnings available to participating securities, basic 0.0 (0.1)
Less: Undistributed earnings available to participating securities, diluted 0.0 (0.1)
Undistributed and distributed earnings available to common stockholders, basic 1.4 21.4
Undistributed and distributed earnings available to common stockholders, diluted $ 1.4 $ 21.4
Denominator:    
Average number of common shares outstanding (in shares) 31,158,000 30,974,200
Effect of dilutive stock-based compensation (in shares) 255,700 366,300
Average number of common and potential common shares outstanding (in shares) 31,413,700 31,340,500