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EARNINGS PER SHARE
 3 Months Ended
Mar. 31, 2021
Earnings Per Share [Abstract]  
EARNINGS PER SHARE EARNINGS PER SHARE
Basic earnings per share is computed by dividing net income by the weighted-average common shares outstanding during a period. Diluted earnings per share is computed based on the weighted-average common shares outstanding plus the effect of dilutive potential common shares outstanding during the period calculated using the treasury stock method. Dilutive potential common shares include employee equity share options, nonvested shares, and similar equity instruments granted by the Company. Potential common share equivalents have been excluded where their inclusion would be anti-dilutive.

The table below presents the computation of basic and diluted earnings per share (in millions, except for per share information):
 Three Months Ended
March 31,
 20212020
Basic:  
Net income$338.2 $310.6 
Weighted-average shares outstanding623.2 624.6 
Basic earnings per share$0.54 $0.50 
Diluted:  
Net income$338.2 $310.6 
Weighted-average shares outstanding623.2 624.6 
Dilutive effect of stock plans8.1 10.5 
Dilutive weighted-average shares outstanding631.3 635.1 
Diluted earnings per share$0.54 $0.49 
Stock options, restricted stock units, and market-based restricted stock units to purchase an aggregate of 1.9 million and 2.0 million shares for the three months ended March 31, 2021 and 2020, respectively, were outstanding, but were not included in the computation of diluted earnings per share because the effect would have been anti-dilutive.