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Net Income (Loss) from Continuing Operations Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Earnings Per Share [Abstract]        
Income (loss) from continuing operations $ 12.7 $ 0.5 $ (168.4) $ (13.3)
Series A Preferred Stock dividends (11.1) (11.1) (33.3) (32.7)
(Income) loss from continuing operations attributable to participating securities (0.4) 0.0 0.0 10.6
Income (loss) from continuing operations attributable to common stockholders $ 1.2 $ (10.6) $ (201.7) $ (35.4)
Shares outstanding        
Weighted average common shares outstanding 109.2 114.6 109.3 118.5
Effect of dilutive stock options and restricted stock awards 0.7 0.0 0.0 0.0
Weighted average common shares outstanding and potential common shares 109.9 114.6 109.3 118.5
Income (loss) from continuing operations per share - basic        
Basic (in dollars per share) $ 0.01 $ (0.09) $ (1.84) $ (0.30)
Income (loss) from continuing operations per share - diluted        
Diluted (in dollars per share) $ 0.01 $ (0.09) $ (1.84) $ (0.30)
Stock options outstanding (in shares) 5.0 5.0 5.0 5.0
Shares attributable to service options excluded from the calculation of diluted net income per share 0.4      
Securities excluded from calculation of earnings per share amount due to performance conditions not yet satisfied 1.5