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Stockholders' Equity - Basic and Diluted Shares Reconciliation (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Numerator (basic and diluted):                      
Net income $ 15.3 $ 24.5 $ 21.5 $ 22.5 $ 20.2 $ 27.7 $ 20.5 $ 17.4 $ 83.8 $ 85.8 $ 94.5
Less: Dividends paid to participating securities                 (0.7) (0.4) (0.3)
Less: Undistributed earnings available to participating securities                 (0.4) (0.2) (0.3)
Undistributed and distributed earnings available to common stockholders                 $ 82.7 $ 85.2 $ 93.9
Denominator:                      
Average number of common shares outstanding (shares)                 30,832,700 30,652,200 30,551,300
Effect of dilutive stock-based compensation (shares)                 271,500 186,100 141,600
Average number of common and potential common shares outstanding (shares)                 31,104,200 30,838,300 30,692,900