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 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Income Statement [Abstract]        
Basic net income per common share (Note 8) $ 0.66 $ 0.54 $ 1.25 $ 1.02
Diluted net income per common share (Note 8) $ 0.62 $ 0.52 $ 1.18 $ 0.98
Basic weighted average shares outstanding 107.0 118.4 107.6 119.1
Diluted weighted average shares outstanding 113.5 123.4 114.2 123.7