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Weighted Average Shares Outstanding (Tables)
 12 Months Ended
Dec. 31, 2016
Earnings Per Share [Abstract]  
Weighted average shares outstanding
 
 
Year Ended December 31,
(in millions)
 
2016
 
2015
 
2014
Weighted average shares outstanding - basic
 
1,357.6

 
1,341.2

 
1,324.3

Net effect of common stock equivalents
 
19.6

 
—

 
—

Weighted average shares outstanding - assuming dilution
 
1,377.2

 
1,341.2

 
1,324.3