Net Income Per Share (Tables)

3 Months Ended

Mar. 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:

	Three Months Ended March 31,
(In millions, except per share data)	2022		2021
Net income - basic and diluted	$	973.5	$	1,115.2
Weighted average shares - basic	106.8		105.4
Effect of dilutive securities:
Stock options	5.0		4.5
Restricted stock awards and restricted stock units	1.3		0.6
Weighted average shares - diluted	113.1		110.5
Net income per share - basic	$	9.12	$	10.58
Net income per share - diluted	$	8.61	$	10.09

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)	2022	2021
Stock options	2.2	5.0