Net Earnings (Loss) Per Share (Tables)

9 Months Ended

Sep. 30, 2021

Earnings Per Share [Abstract]

Calculations of Net Earnings (Loss) Per Share - Basic and Diluted

The calculations of net earnings (loss) per share - basic and net earnings (loss) per share - diluted were as follows:

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2021		2020		2021		2020
Net earnings (loss) available to common shareholders	$	97.7	$	10.3	$	271.3	$	(52.4	)
Weighted-average common shares outstanding (in millions)
Weighted-average common shares outstanding - basic		54.3		58.2		54.7		58.4
Effect of dilutive securities - stock options		0.2		—		0.1		—
Effect of other share-based awards		0.7		0.3		0.6		—
Weighted-average common shares outstanding - diluted		55.2		58.5		55.4		58.4
Net earnings (loss) per share - basic	$	1.80	$	0.18	$	4.96	$	(0.90	)
Net earnings (loss) per share - diluted	$	1.77	$	0.18	$	4.90	$	(0.90	)