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Net Income Per Share (Schedule of Income Per Share) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Income Per Share Calculation [Line Items]      
Net income $ 52.2 $ 175.0 $ 54.4
Preferred stock dividends, undeclared and cumulative 0.0 2.1 6.7
Net income (loss) allocable to common stockholders $ 50.7 $ 135.3 $ 5.8
Average number of shares outstanding, basic 14,601 13,493 9,825
Potentially dilutive shares related to stock options 387 386 298
Average number of shares outstanding, diluted 14,988 13,879 10,123
Net income (loss) per common share - basic $ 3.47 $ 10.03 $ 0.59
Net income (loss) per common share - diluted $ 3.38 $ 9.75 $ 0.57
Exchange of preferred stock for common stock and common stock warrant   $ 0.0  
Preferred Stock Dividends and Other Adjustments $ 0.0 37.6 $ 41.9
Distributed earnings allocable to warrant modification 1.5 0.0 0.0
Accumulated Deficit [Member]      
Income Per Share Calculation [Line Items]      
Net income 52.2 175.0 54.4
Exchange of preferred stock for common stock and common stock warrant   (7.6)  
Distributed earnings allocable to warrant modification $ 1.5 $ 0.0 $ 0.0