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Net Income Per Share (Tables)
 6 Months Ended
Jun. 30, 2023
Earnings Per Share [Abstract]  
Basic and Diluted Net Income (Loss) Per Share The calculations of basic and diluted net income per share are as follows:
Three Months Ended
June 30,		Six Months Ended
June 30,
(In millions, except per share data)2023202220232022
Net income - basic and diluted$968.4 $852.1 $1,786.2 $1,825.6 
Weighted average shares - basic107.0 107.9 107.0 107.3 
Effect of dilutive securities:
Stock options4.8 4.7 4.9 4.9 
Restricted stock awards and restricted stock units2.1 1.4 2.0 1.4 
Weighted average shares - diluted113.9 114.0 113.9 113.6 
Net income per share - basic$9.05 $7.90 $16.69 $17.01 
Net income per share - diluted$8.50 $7.47 $15.68 $16.07 
Antidilutive Securities
Shares which have been excluded from diluted per share amounts because their effect would have been antidilutive include the following:
Three Months Ended
June 30,		Six Months Ended
June 30,
(Shares in millions)2023202220232022
Stock options1.7 2.2 1.7 2.3