Net Earnings Per Common Share (Tables)

9 Months Ended

Sep. 30, 2021

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: 

	Three Months Ended September 30,				Nine Months Ended September 30,
(In millions, except per share amounts)	2021		2020		2021		2020
Basic Net Earnings Per Common Share:
Numerator:
Net earnings	$	107.7	$	134.0	$	325.9	$	360.7
Distributed and allocated undistributed net earnings to unvested restricted stockholders	—		—		—		(0.1)
Net earnings available to common stockholders	$	107.7	$	134.0	$	325.9	$	360.6
Denominator:
Weighted average number of common shares outstanding - basic	149.9		155.5		151.8		155.2
Basic net earnings per common share:
Basic net earnings per common share	$	0.72	$	0.86	$	2.15	$	2.32
Diluted Net Earnings Per Common Share:
Numerator:
Net earnings available to common stockholders	$	107.7	$	134.0	$	325.9	$	360.6
Denominator:
Weighted average number of common shares outstanding - basic	149.9		155.5		151.8		155.2
Effect of dilutive stock shares and units	1.5		0.6		1.4		0.6
Weighted average number of common shares outstanding - diluted under treasury stock	151.4		156.1		153.2		155.8
Diluted net earnings per common share	$	0.71	$	0.86	$	2.13	$	2.31