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Earnings per share ("EPS") (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Earnings per share        
Basic EPS - Net income (loss) $ 175.3 $ 94.4 $ 346.8 $ (4.4)
Basic EPS - (in shares) 191,000,000.0 190,200,000 191,000,000.0 189,600,000
Basic EPS (in dollars per share) $ 0.92 $ 0.50 $ 1.82 $ (0.02)
Effect of dilutive securities - (in shares) 400,000 400,000 300,000  
Effect of dilutive securities - (in dollars per share)     (0.01)  
Diluted EPS - Net income (loss) $ 175.3 $ 94.4 $ 346.8 $ (4.4)
Diluted EPS - (in shares) 191,400,000 190,600,000 191,300,000 189,600,000
Diluted EPS (in dollars per share) $ 0.92 $ 0.50 $ 1.81 $ (0.02)
Stock options        
Earnings per share        
Securities excluded from computation of diluted EPS (in shares) 61,594 0 61,594 0
Restricted shares        
Earnings per share        
Securities excluded from computation of diluted EPS (in shares)     66,996 65,630