Net (Loss) Earnings Per Share (Tables)

6 Months Ended

Jun. 30, 2020

Earnings Per Share [Abstract]

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

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

	3 Months Ended					6 Months Ended
	June 30,					June 30,
	2020			2019		2020			2019
Net (loss) earnings available to common shareholders	$	(64.4	)	$	127.3	$	(62.7	)	$	180.8
Weighted-average common shares outstanding (in millions)
Weighted-average common shares outstanding - basic		58.2			60.0		58.5			60.3
Effect of dilutive securities - stock options		—			0.1		—			0.1
Effect of other share-based awards		—			0.3		—			0.3
Weighted-average common shares outstanding - diluted		58.2			60.4		58.5			60.7
Net (loss) earnings per share - basic	$	(1.11	)	$	2.12	$	(1.07	)	$	3.00
Net (loss) earnings per share - diluted	$	(1.11	)	$	2.11	$	(1.07	)	$	2.98