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Net Income Per Share (Tables)
12 Months Ended
Dec. 31, 2021
Earnings Per Share [Abstract]  
Net Income Per Share
Basic and diluted net income per share are calculated using the treasury stock method.
(in millions, except per share data)202120202019
Basic
Net income$1,864.4 $2,030.4 $1,541.3 
Average shares outstanding262.5 271.3 275.4 
Basic net income per share$7.10 $7.48 $5.60 
Diluted
Net income$1,864.4 $2,030.4 $1,541.3 
Average shares outstanding assuming dilution:
Average shares outstanding262.5 271.3 275.4 
Stock options and other contingently issuable shares (1)
4.6 4.5 4.8 
Non-vested restricted stock grants — 0.1 
Average shares outstanding assuming dilution267.1 275.8 280.3 
Diluted net income per share$6.98 $7.36 $5.50 
(1)    Stock options and other contingently issuable shares excludes 0.9 million, 1.0 million and 1.3 million shares at December 31, 2021, 2020 and 2019, respectively, due to their anti-dilutive effect.