Net Earnings Per Common Share (Tables)

3 Months Ended

Mar. 31, 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 March 31,
(In millions, except per share amounts)	2021		2020
Basic Net Earnings Per Common Share:
Numerator:
Net earnings	$	110.1	$	126.6
Distributed and allocated undistributed net earnings to unvested restricted stockholders	—		(0.1)
Net earnings available to common stockholders	$	110.1	$	126.5
Denominator:
Weighted average number of common shares outstanding - basic	154.1		154.5
Basic net earnings per common share:
Basic net earnings per common share	$	0.71	$	0.82
Diluted Net Earnings Per Common Share:
Numerator:
Net earnings available to common stockholders	$	110.1	$	126.5
Denominator:
Weighted average number of common shares outstanding - basic	154.1		154.5
Effect of dilutive stock shares and units	1.3		0.3
Weighted average number of common shares outstanding - diluted under treasury stock	155.4		154.8
Diluted net earnings per common share	$	0.71	$	0.82