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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, 2021
Mar. 31, 2021
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2021
Jun. 30, 2020
Income Per Share Calculation [Line Items]            
Net income (loss) $ 11.6 $ 5.1 $ 33.7 $ 11.3 $ 16.7 $ 45.0
Preferred stock dividends, undeclared and cumulative 0.7   2.0   1.4 4.0
Distributed earnings allocable to retired preferred shares 0.0   0.0   6.6 0.0
Net income (loss) allocable to common stockholders $ 10.9   $ 31.7   $ 8.7 $ 41.0
Average number of shares outstanding, basic 13,443   9,675   13,132 9,647
Potentially dilutive shares related to stock options 300   252   320 235
Average number of shares outstanding, diluted 13,743   9,927   13,452 9,882
Net income (loss) per common share - basic $ 0.81   $ 3.28   $ 0.66 $ 4.25
Net income (loss) per common share - diluted $ 0.79   $ 3.19   $ 0.65 $ 4.15