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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 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
Income Per Share Calculation [Line Items]                    
Net income (loss) $ 16.4 $ (7.0) $ 33.7 $ 11.3 $ (2.8) $ 22.8 $ (15.6) $ (20.9) $ 54.4 $ (16.5)
Preferred stock dividends, undeclared and cumulative 0.8 1.9 2.0 2.0 1.9 1.9 2.0 2.0 6.7 7.8
Preferred Stock Dividends and Other Adjustments                 41.9 0.0
Net income (loss) allocable to common stockholders $ (26.3) $ (8.9) $ 31.7 $ 9.3 $ (4.7) $ 20.9 $ (17.6) $ (22.9) $ 5.8 $ (24.3)
Average number of shares outstanding, basic                 9,825 9,566
Potentially dilutive shares related to stock options                 298 0
Average number of shares outstanding, diluted                 10,123 9,566
Net income (loss) per common share - basic $ (2.55) $ (0.83) $ 3.28 $ 0.97 $ (0.49) $ 2.18 $ (1.84) $ (2.40) $ 0.59 $ (2.54)
Net income (loss) per common share - diluted $ (2.55) $ (0.83) $ 3.19 $ 0.95 $ (0.49) $ 2.17 $ (1.84) $ (2.40) $ 0.57 $ (2.54)
Antidilutive securities excluded from computation of earnings per share                 0 67
Options with exercise price greater than market price                 0 352