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Earnings per Share ("EPS") (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Earnings per share        
Basic EPS - Net (loss) income $ 79.5 $ 184.5 $ 224.0 $ 341.0
Basic EPS - (in shares) 192,300,000 191,900,000 192,200,000 191,900,000
Basic earnings per share (in dollars per share) $ 0.41 $ 0.96 $ 1.17 $ 1.78
Effect of dilutive securities - (in shares) 200,000 300,000 200,000 300,000
Effect of dilutive securities - (in dollars per share)     (0.01) (0.01)
Diluted EPS - Net (loss) income $ 79.5 $ 184.5 $ 224.0 $ 341.0
Diluted EPS - (in shares) 192,500,000 192,200,000 192,400,000 192,200,000
Diluted EPS (in dollars per share) $ 0.41 $ 0.96 $ 1.16 $ 1.77
Share options        
Earnings per share        
Securities excluded from computation of diluted EPS (in shares) 6,560 59,636 1,282 47,767