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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Numerator        
Net income $ 61.7 $ 60.9 $ 193.8 $ 172.7
Less: Net income attributable to participating securities (1.4) (1.4) (4.4) (4.0)
Net income attributable to common shareholders - Basic 60.3 59.5 189.4 168.7
Undistributed earnings reallocated to common shareholders under two step dilutive method 0.0 0.0 0.0 0.0
Net income attributable to common shareholders - Dilutive $ 60.3 $ 59.5 $ 189.4 $ 168.7
Denominators        
Basic - Weighted-average shares outstanding 78.3 77.8 78.2 77.7
Basic - Less: Participating securities (1.8) (1.8) (1.8) (1.8)
Basic - Weighted-average common shares outstanding 76.5 76.0 76.4 75.9
Effect of dilutive securities - dilutive stock-based compensation 0.5 0.4 0.4 0.4
Diluted - Adjusted weighted-average shares after assumed conversions 77.0 76.4 76.8 76.3
Basic EPS $ 0.79 $ 0.78 $ 2.48 $ 2.22
Diluted EPS $ 0.78 $ 0.78 $ 2.47 $ 2.21