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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
Mar. 31, 2024
Mar. 31, 2023
Earnings Per Share [Abstract]    
Income from continuing operations $ 18.5 $ 12.7
Series A Preferred Stock dividends (11.1) (11.1)
Income from continuing operations attributable to participating securities (1.8) (0.4)
Income from continuing operations attributable to common stockholders $ 5.6 $ 1.2
Shares outstanding    
Weighted average common shares outstanding 108.3 109.3
Effect of dilutive stock options and restricted stock awards 0.9 0.6
Weighted average common shares outstanding and potential common shares 109.2 109.9
Income (loss) from continuing operations per share - basic    
Basic (in dollars per share) $ 0.05 $ 0.01
Income (loss) from continuing operations per share - diluted    
Diluted (in dollars per share) $ 0.05 $ 0.01
Shares attributable to service options excluded from the calculation of diluted net income per share 0.4 0.5
Securities excluded from calculation of earnings per share amount due to performance conditions not yet satisfied 1.3 1.6
Stock options outstanding (in shares) 4.5 4.7