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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

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