Quarterly report pursuant to Section 13 or 15(d)

Consolidated Statements of Operations (Parenthetical)

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Consolidated Statements of Operations (Parenthetical) (USD $)
In Millions, except Per Share data, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Income Statement [Abstract]        
Basic net income per common share (Note 8) $ 0.54 $ 0.46 $ 1.79 $ 1.48
Diluted net income per common share (Note 8) $ 0.51 $ 0.43 $ 1.69 $ 1.42
Basic weighted average shares outstanding 104.7 114.6 106.6 117.6
Diluted weighted average shares outstanding 111.1 120.5 113.1 122.6