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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, 2020	Mar. 31, 2019
Income Per Share Calculation [Line Items]
Net income (loss)	$ 11.3	$ (20.9)
Preferred stock dividends, undeclared and cumulative	2.0	2.0
Net income (loss) allocable to common stockholders	$ 9.3	$ (22.9)
Average number of shares outstanding, basic	9,619	9,532
Potentially dilutive shares related to stock options	220	0
Average number of shares outstanding, diluted	9,839	9,532
Net income (loss) per common share - basic	$ 0.97	$ (2.40)
Net income (loss) per common share - diluted	$ 0.95	$ (2.40)
Antidilutive securities excluded from computation of earnings per share	0	41
Options with exercise price greater than market price	0	360

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