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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Numerator    
Net income $ 61.1 $ 53.2
Less: Net income attributable to participating securities (1.4) (1.2)
Net income attributable to common shareholders - Basic 59.7 52.0
Undistributed earnings reallocated to common shareholders under two step dilutive method 0.0 0.0
Net income attributable to common shareholders - Dilutive $ 59.7 $ 52.0
Denominators    
Basic - Weighted-average shares outstanding 77.9 77.5
Basic - Less: Participating securities (1.7) (1.7)
Basic - Weighted-average common shares outstanding 76.2 75.8
Effect of dilutive securities - dilutive stock-based compensation 0.3 0.3
Diluted - Adjusted weighted-average shares after assumed conversions 76.5 76.1
Basic EPS $ 0.78 $ 0.69
Diluted EPS $ 0.78 $ 0.68