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Earnings per share (EPS) (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Earnings per share        
Basic EPS - Net income $ 196.5 $ 175.3 $ 378.5 $ 346.8
Basic EPS - (in shares) 191,500,000 191,000,000.0 191,400,000 191,000,000.0
Basic earnings per share (in dollars per share) $ 1.03 $ 0.92 $ 1.98 $ 1.82
Effect of dilutive securities - (in shares) 400,000 400,000 400,000 300,000
Effect of dilutive securities - (in dollars per share) (0.01)   (0.01) (0.01)
Diluted EPS - Net income $ 196.5 $ 175.3 $ 378.5 $ 346.8
Diluted EPS - (in shares) 191,900,000 191,400,000 191,800,000 191,300,000
Diluted EPS (in dollars per share) $ 1.02 $ 0.92 $ 1.97 $ 1.81
Stock options        
Earnings per share        
Securities excluded from computation of diluted EPS (in shares) 109,948 61,594 109,948  
Restricted shares        
Earnings per share        
Securities excluded from computation of diluted EPS (in shares)   66,996 66,794