Earnings per Share (Tables)

12 Months Ended

Dec. 31, 2021

Earnings Per Share [Abstract]

Reconciliation of Numerator and Denominator of Basic and Diluted Earnings per Share Calculation and Anti-dilutive Share-based Awards

The reconciliation of the numerator and denominator of the basic and diluted earnings (loss) per share calculation and the anti-dilutive share-based awards for the years ended December 31, 2021, 2020 and 2019, were as follows:

	Year Ended December 31,
	2021		2020			2019
Net earnings (loss) per share:
Basic	$	4.36	$	(0.76	)	$	1.10
Diluted		4.14		(0.76	)		1.10
Numerator:
Net earnings (loss)	$	145.9	$	(25.9	)	$	37.6
Denominator:
Weighted average number of common shares outstanding		33.5		33.9			34.1
Dilutive awards		1.7		—			0.2
Diluted weighted average number of common shares outstanding		35.2		33.9			34.3
Weighted average number of anti-dilutive share-based awards:
Restricted stock units		—		0.4			0.7
Stock options		—		0.8			0.8
Total		—		1.2			1.5