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Net Income Per Share (Schedule of Income Per Share) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2022
Jun. 30, 2021
Earnings Per Share [Abstract]            
Net income (loss) $ 37.4 $ (0.4) $ 11.6 $ 5.1 $ 37.0 $ 16.7
Preferred stock dividends, undeclared and cumulative 0.0   0.7   0.0 1.4
Distributed earnings allocable to retired preferred shares 0.0   0.0   0.0 6.6
Net income (loss) allocable to common stockholders $ 37.4   $ 10.9   $ 37.0 $ 8.7
Average number of shares outstanding, basic 14,587   13,443   14,567 13,132
Potentially dilutive shares related to stock options 289   300   336 320
Average number of shares outstanding, diluted 14,876   13,743   14,903 13,452
Net income (loss) per common share - basic $ 2.56   $ 0.81   $ 2.54 $ 0.66
Net income (loss) per common share - diluted $ 2.51   $ 0.79   $ 2.48 $ 0.65
Antidilutive securities excluded from computation of earnings per share 4   0   0 0