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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
Mar. 31, 2021
Mar. 31, 2020
Income Per Share Calculation [Line Items]    
Net income (loss) $ 5.1 $ 11.3
Preferred stock dividends, undeclared and cumulative 0.7 2.0
Distributed earnings allocable to retired preferred shares 6.6 0.0
Net income (loss) allocable to common stockholders $ (2.2) $ 9.3
Average number of shares outstanding, basic 12,818 9,619
Potentially dilutive shares related to stock options 0 220
Average number of shares outstanding, diluted 12,818 9,839
Net income (loss) per common share - basic $ (0.17) $ 0.97
Net income (loss) per common share - diluted $ (0.17) $ 0.95
Antidilutive securities excluded from computation of earnings per share 378 0