Net Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2022

Earnings Per Share [Abstract]

Calculations of Net Earnings Per Share - Basic and Diluted

The calculation of net earnings per share - basic and net earnings per share - diluted were as follows:

Year Ended December 31	2022		2021		2020
Net earnings available to common shareholders:	$	373.8	$	382.4	$	23.8
Weighted-average common shares outstanding (in millions):
Weighted-average common shares outstanding - basic		52.2		54.5		58.0
Effect of dilutive securities - stock options		—		0.2		—
Effect of other share-based awards		0.6		0.7		0.3
Weighted-average common shares outstanding - diluted		52.8		55.4		58.3
Net earnings per share - basic	$	7.17	$	7.01	$	0.41
Net earnings per share - diluted	$	7.08	$	6.91	$	0.41