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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, 2020
Mar. 31, 2020
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2020
Jun. 30, 2019
Income Per Share Calculation [Line Items]            
Net income (loss) $ 33.7 $ 11.3 $ (15.6) $ (20.9) $ 45.0 $ (36.5)
Preferred stock dividends, undeclared and cumulative 2.0   2.0   4.0 4.0
Net income (loss) allocable to common stockholders $ 31.7   $ (17.6)   $ 41.0 $ (40.5)
Average number of shares outstanding, basic 9,675   9,565   9,647 9,549
Potentially dilutive shares related to stock options 252   0   235 0
Average number of shares outstanding, diluted 9,927   9,565   9,882 9,549
Net income (loss) per common share - basic $ 3.28   $ (1.84)   $ 4.25 $ (4.24)
Net income (loss) per common share - diluted $ 3.19   $ (1.84)   $ 4.15 $ (4.24)
Antidilutive securities excluded from computation of earnings per share 0   77   0 80
Options with exercise price greater than market price 0   360   0 360