Net Earnings per Common Share (Tables)

12 Months Ended

Dec. 31, 2022

Earnings Per Share [Abstract]

Calculation of Basic and Diluted Net Earnings Per Common Share

The following table shows the calculation of basic and diluted net earnings per common share: 

	Year Ended December 31,
(In millions, except per share amounts)	2022		2021		2020
Basic Net Earnings Per Common Share:
Numerator:
Net earnings	$	491.6	$	506.8	$	502.9
Distributed and allocated undistributed net earnings to unvested restricted stockholders	—		—		(0.2)
Net earnings available to common stockholders	$	491.6	$	506.8	$	502.7
Denominator:
Weighted average number of common shares outstanding - basic	145.9		150.9		155.2
Basic net earnings per common share:
Basic net earnings per common share	$	3.37	$	3.36	$	3.24
Diluted Net Earnings Per Common Share:
Numerator:
Net earnings available to common stockholders	$	491.6	$	506.8	$	502.7
Denominator:
Weighted average number of common shares outstanding - basic	145.9		150.9		155.2
Effect of dilutive stock shares and units	1.5		1.5		0.8
Weighted average number of common shares outstanding - diluted under treasury stock	147.4		152.4		156.0
Diluted net earnings per common share	$	3.33	$	3.32	$	3.22