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Earnings Per Share Computation of Basic and Diluted Income Per Common 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 $ 114.0 $ 99.6 $ 204.8 $ 189.6
Less: distributed and undistributed earnings allocated to participating securities (1.4) (1.6) (2.6) (2.9)
Net income attributable to common shareholders $ 112.6 $ 98.0 $ 202.2 $ 186.7
Denominator:        
Weighted average basic common shares outstanding 96.8 96.9 97.0 96.9
Effect of dilutive securities 0.1 0.0 0.1 0.0
Diluted common shares outstanding 96.9 96.9 97.1 96.9
Basic income per common share (in dollars per share) $ 1.16 $ 1.01 $ 2.09 $ 1.93
Diluted income per common share (in dollars per share) $ 1.16 $ 1.01 $ 2.08 $ 1.93