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Net Income Per Share (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Numerator (basic and diluted):    
Net income $ 21.6 $ 22.5
Less: Dividends paid to participating securities (0.1) (0.3)
Less: Undistributed earnings available to participating securities (0.1) 0.0
Undistributed and distributed earnings available to common stockholders $ 21.4 $ 22.2
Denominator:    
Average number of common shares outstanding (in shares) 30,974,200 30,712,300
Effect of dilutive stock-based compensation (in shares) 366,300 197,700
Average number of common and potential common shares outstanding (in shares) 31,340,500 30,910,000