Net Income Per Share (Tables)

12 Months Ended

Dec. 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:

	Year Ended December 31,
(In millions, except per share data)	2023		2022		2021
Net income - basic and diluted	$	3,953.6	$	4,338.4	$	8,075.3
Weighted average shares - basic	106.7		107.1		105.7
Effect of dilutive securities:
Stock options	4.9		4.9		5.4
Restricted stock awards and restricted stock units	2.1		1.5		1.1
Weighted average shares - diluted	113.7		113.5		112.2
Net income per share - basic	$	37.05	$	40.51	$	76.40
Net income per share - diluted	$	34.77	$	38.22	$	71.97

Antidilutive securities

Shares which have been excluded from diluted per share amounts because their effect would have been antidilutive include the following:

	Year Ended December 31,
(Shares in millions)	2023	2022	2021
Stock options	1.8	2.3	2.9