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Net Income Per Share (Tables)
3 Months Ended
Mar. 31, 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
March 31,
(In millions, except per share data)20232022
Net income - basic and diluted$817.8 $973.5 
Weighted average shares - basic107.1 106.8 
Effect of dilutive securities:
Stock options5.0 5.0 
Restricted stock awards and restricted stock units1.9 1.3 
Weighted average shares - diluted114.0 113.1 
Net income per share - basic$7.64 $9.12 
Net income per share - diluted$7.17 $8.61 
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
March 31,
(Shares in millions)20232022
Stock options1.7 2.2