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Earnings per share (EPS) (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Earnings per share    
Basic EPS - Net income (loss) $ 733.7 $ 326.2
Basic EPS - (in shares) 191,100,000 190,300,000
Basic EPS (in dollars per share) $ 3.84 $ 1.71
Effect of dilutive securities - (in shares) 400,000 400,000
Effect of dilutive securities - (in dollars per share) (0.01)  
Diluted EPS - Net income (loss) $ 733.7 $ 326.2
Diluted EPS - (in shares) 191,500,000 190,700,000
Diluted EPS (in dollars per share) $ 3.83 $ 1.71
Securities excluded from computation of diluted EPS (in shares) 61,594 6,034
Stock options    
Earnings per share    
Securities excluded from computation of diluted EPS (in shares) 4,700 3,534
Restricted shares    
Earnings per share    
Securities excluded from computation of diluted EPS (in shares) 66,794 66,996