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NET INCOME PER SHARE
 3 Months Ended
Mar. 31, 2021
Earnings Per Share [Abstract]  
NET INCOME PER SHARE NET INCOME PER SHARE
Basic and diluted net income per share are calculated using the treasury stock method.
(in millions, except per share data)Three Months Ended
March 31,
20212020
Basic
Net income$409.6 $321.7 
Average shares outstanding265.8 273.2 
Basic net income per share$1.54 $1.18 
Diluted
Net income$409.6 $321.7 
Average shares outstanding assuming dilution:
Average shares outstanding265.8 273.2 
Stock options and other contingently issuable shares (1)
4.8 5.3 
Non-vested restricted stock grants— 0.1 
Average shares outstanding assuming dilution270.6 278.6 
Diluted net income per share$1.51 $1.15 
(1)There were no stock options and other contingently issuable shares excluded due to their anti-dilutive effect for the three months ended March 31, 2021. There were 1.4 million stock options and other contingently issuable shares excluded due to their anti-dilutive effect for the three months ended March 31, 2020.