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Earnings per share ("EPS") (Details) - USD ($)
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Earnings per share    
Basic EPS - Earnings $ 64,600,000 $ 45,600,000
Basic EPS - (in shares) 185,900,000 178,500,000
Basic EPS (in dollars per share) $ 0.35 $ 0.26
Effect of dilutive securities - (in shares) 300,000 1,300,000
Effect of dilutive securities - (in dollars per share)   $ (0.01)
Diluted EPS - Earnings $ 64,600,000 $ 45,600,000
Diluted EPS - (in shares) 186,200,000 179,800,000
Diluted EPS (in dollars per share) $ 0.35 $ 0.25
Stock options    
Earnings per share    
Securities excluded from computation of diluted EPS (in shares) 97,789 0
Restricted shares    
Earnings per share    
Securities excluded from computation of diluted EPS (in shares) 73,762 84,094