Net Income Per Share (Tables)

9 Months Ended

Sep. 30, 2021

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)	2021		2020		2021		2020
Net income - basic and diluted	$	1,632.2	$	842.1	$	5,846.3	$	2,364.0
Weighted average shares - basic	106.2		105.5		105.5		108.3
Effect of dilutive securities:
Stock options	6.4		7.8		5.3		7.3
Restricted stock awards and restricted stock units	1.3		0.6		1.0		0.5
Weighted average shares - diluted	113.9		113.9		111.8		116.1
Net income per share - basic	$	15.37	$	7.98	$	55.42	$	21.83
Net income per share - diluted	$	14.33	$	7.39	$	52.29	$	20.36

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)	2021	2020	2021	2020
Stock options	0.4	0.1	4.8	2.6