Net Income Per Share (Tables)

3 Months Ended

Mar. 31, 2024

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)	2024		2023
Net income - basic and diluted	$	722.0	$	817.8
Weighted average shares - basic	107.8		107.1
Effect of dilutive securities:
Stock options	5.3		5.0
Restricted stock awards and restricted stock units	2.0		1.9
Weighted average shares - diluted	115.1		114.0
Net income per share - basic	$	6.70	$	7.64
Net income per share - diluted	$	6.27	$	7.17

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)	2024	2023
Stock options	1.5	1.7