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Earnings per share ("EPS") (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Earnings per share        
Basic EPS - (Loss) earnings $ 94.4 $ 64.0 $ (4.4) $ 129.2
Basic EPS - (in shares) 190,200,000 187,200,000 189,600,000 187,100,000
Basic EPS (in dollars per share) $ 0.50 $ 0.34 $ (0.02) $ 0.69
Effect of dilutive securities - (in shares) 400,000 300,000   300,000
Diluted EPS - Loss) earnings $ 94.4 $ 64.0 $ (4.4) $ 129.2
Diluted EPS - (in shares) 190,600,000 187,500,000 189,600,000 187,400,000
Diluted EPS (in dollars per share) $ 0.50 $ 0.34 $ (0.02) $ 0.69
Stock options        
Earnings per share        
Securities excluded from computation of diluted EPS (in shares) 0 251,613 0 251,613
Restricted shares        
Earnings per share        
Securities excluded from computation of diluted EPS (in shares) 65,360 69,442 65,360 69,442