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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Numerator        
Net income $ 58.6 $ 52.2 $ 111.8 $ 85.8
Less: Net income attributable to participating securities (1.4) (1.1) (2.6) (1.6)
Net income attributable to common shareholders - Basic 57.2 51.1 109.2 84.2
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 $ 57.2 $ 51.1 $ 109.2 $ 84.2
Denominators        
Basic - Weighted-average shares outstanding 77.8 77.4 77.7 77.2
Basic - Less: Participating securities (1.9) (1.6) (1.9) (1.5)
Basic - Weighted-average common shares outstanding 75.9 75.8 75.8 75.7
Effect of dilutive securities - dilutive stock-based compensation 0.4 0.1 0.4 0.1
Diluted - Adjusted weighted-average shares after assumed conversions 76.3 75.9 76.2 75.8
Basic EPS $ 0.75 $ 0.67 $ 1.44 $ 1.11
Diluted EPS $ 0.75 $ 0.67 $ 1.43 $ 1.11