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Net Income (Loss) from Continuing Operations Per Share (Tables)
 12 Months Ended
Dec. 31, 2023
Earnings Per Share [Abstract]  
Schedule of computation of net income (loss) from continuing operations per share
The following table sets forth the computation of income (loss) from continuing operations per share (in millions except per share amounts):
 Year Ended December 31,
 202320222021
Income (loss) from continuing operations$(154.8)$28.6 $(0.8)
Series A Preferred Stock dividends(44.4)(43.8)(41.1)
(Income) loss from continuing operations attributable to participating securities
— 3.6 9.0 
Income (loss) from continuing operations attributable to common stockholders$(199.2)$(11.6)$(32.9)
Weighted average common shares outstanding109.1 116.3 123.0 
Effect of dilutive stock options and restricted stock awards— — — 
Weighted average common shares outstanding and potential common shares109.1 116.3 123.0 
Income (loss) from continuing operations per share  
Basic$(1.83)$(0.10)$(0.27)
Diluted$(1.83)$(0.10)$(0.27)