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Earnings per share ("EPS") (Details)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
USD ($)
$ / shares
shares
Jun. 30, 2017
USD ($)
$ / shares
shares
Jun. 30, 2018
USD ($)
$ / shares
shares
Jun. 30, 2017
USD ($)
$ / shares
shares
Earnings per share        
Basic EPS - Earnings | $ $ 53.6 $ 45.6 $ 118.2 $ 91.2
Basic EPS - (in shares) 186,000,000 181,600,000 186,000,000 180,100,000
Basic EPS (in dollars per share) | $ / shares $ 0.29 $ 0.25 $ 0.64 $ 0.51
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 | $ $ 53.6 $ 45.6 $ 118.2 $ 91.2
Diluted EPS - (in shares) 186,300,000 182,000,000 186,300,000 180,500,000
Diluted EPS (in dollars per share) | $ / shares $ 0.29 $ 0.25 $ 0.63 $ 0.51
Stock options        
Earnings per share        
Securities excluded from computation of diluted EPS (in shares) 97,789 0 97,789 263,568
Restricted shares        
Earnings per share        
Securities excluded from computation of diluted EPS (in shares) 73,762 84,094 73,762 84,094