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Weighted Average Shares Outstanding (Tables)
 12 Months Ended
Dec. 31, 2018
Earnings Per Share [Abstract]  
Weighted average shares outstanding
 
Year Ended December 31,
(in millions)
2018
 
2017
 
2016
Weighted average shares outstanding - basic
1,381.0

 
1,370.1

 
1,357.6

Net effect of common stock equivalents
20.4

 
22.6

 
19.6

Weighted average shares outstanding - assuming dilution
1,401.4

 
1,392.7

 
1,377.2