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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, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Numerator        
Net income $ 60.9 $ 44.0 $ 172.7 $ 129.8
Less: Net income attributable to participating securities (1.4) (0.9) (4.0) (2.6)
Net income attributable to common shareholders - Basic 59.5 43.1 168.7 127.2
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 $ 59.5 $ 43.1 $ 168.7 $ 127.2
Denominators        
Basic - Weighted-average shares outstanding 77.8 77.4 77.7 77.2
Basic - Less: Participating securities (1.8) (1.7) (1.8) (1.5)
Basic - Weighted-average common shares outstanding 76.0 75.7 75.9 75.7
Effect of dilutive securities - dilutive stock-based compensation 0.4 0.2 0.4 0.2
Diluted - Adjusted weighted-average shares after assumed conversions 76.4 75.9 76.3 75.9
Basic EPS $ 0.78 $ 0.57 $ 2.22 $ 1.68
Diluted EPS $ 0.78 $ 0.57 $ 2.21 $ 1.68