Net Income Per Share (Tables)

12 Months Ended

Dec. 31, 2022

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)	2022		2021		2020
Net income - basic and diluted	$	4,338.4	$	8,075.3	$	3,513.2
Weighted average shares - basic	107.1		105.7		107.6
Effect of dilutive securities:
Stock options	4.9		5.4		7.0
Restricted stock awards and restricted stock units	1.5		1.1		0.5
Weighted average shares - diluted	113.5		112.2		115.1
Net income per share - basic	$	40.51	$	76.40	$	32.65
Net income per share - diluted	$	38.22	$	71.97	$	30.52

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)	2022	2021	2020
Stock options	2.3	2.9	2.7