Net Income Per Share (Tables)

9 Months Ended

Sep. 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 September 30,				Nine Months Ended September 30,
(In millions, except per share data)	2023		2022		2023		2022
Net income - basic and diluted	$	1,007.8	$	1,315.7	$	2,794.0	$	3,141.3
Weighted average shares - basic	106.3		106.9		106.8		107.2
Effect of dilutive securities:
Stock options	4.8		4.3		4.9		4.7
Restricted stock awards and restricted stock units	2.3		1.6		2.0		1.4
Weighted average shares - diluted	113.4		112.8		113.7		113.3
Net income per share - basic	$	9.48	$	12.31	$	26.16	$	29.30
Net income per share - diluted	$	8.89	$	11.66	$	24.57	$	27.73

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 September 30,		Nine Months Ended September 30,
(Shares in millions)	2023	2022	2023	2022
Stock options	1.7	2.4	1.7	2.3