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Earnings per Share ("EPS") (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Earnings per share    
Basic EPS - Net (loss) income $ (466.4) $ 700.6
Basic EPS - (in shares) 192,000,000.0 191,500,000
Basic earnings per share (in dollars per share) $ (2.43) $ 3.66
Effect of dilutive securities - (in shares) 300,000 400,000
Effect of dilutive securities - (in dollars per share)   (0.01)
Diluted EPS - Net (loss) income $ (466.4) $ 700.6
Diluted EPS - (in shares) 192,300,000 191,900,000
Diluted EPS (in dollars per share) $ (2.43) $ 3.65
Stock options    
Earnings per share    
Securities excluded from computation of diluted EPS (in shares) 0 134,488
Restricted shares    
Earnings per share    
Securities excluded from computation of diluted EPS (in shares) 0 2,295