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Earnings per share ("EPS") (Details)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
$ / shares
shares
Sep. 30, 2017
USD ($)
$ / shares
shares
Sep. 30, 2018
USD ($)
$ / shares
shares
Sep. 30, 2017
USD ($)
$ / shares
shares
Earnings per share        
Basic EPS - Earnings | $ $ 52.1 $ 60.0 $ 170.3 $ 151.2
Basic EPS - (in shares) 186,100,000 185,500,000 186,100,000 181,900,000
Basic EPS (in dollars per share) | $ / shares $ 0.28 $ 0.32 $ 0.92 $ 0.83
Effect of dilutive securities - (in shares) 300,000 400,000 300,000 400,000
Effect of dilutive securities - (in dollars per share) | $ / shares     (0.01)  
Diluted EPS - Earnings | $ $ 52.1 $ 60.0 $ 170.3 $ 151.2
Diluted EPS - (in shares) 186,400,000 185,900,000 186,400,000 182,300,000
Diluted EPS (in dollars per share) | $ / shares $ 0.28 $ 0.32 $ 0.91 $ 0.83
Stock options        
Earnings per share        
Securities excluded from computation of diluted EPS (in shares) 145,521 0 145,521 263,568
Restricted shares        
Earnings per share        
Securities excluded from computation of diluted EPS (in shares) 73,762 84,094 73,762 84,094