Consolidated Statements of Equity - USD ($) shares in Millions, $ in Millions		Total		Common Stock	Treasury Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Loss
Balance at Dec. 31, 2018		$ 226.0		$ 0.3	$ (2.4)	$ 216.5	$ 94.3	$ (82.7)
Balance (in shares) at Dec. 31, 2018				34.2	0.1
Net (loss) earnings		37.6		$ 0.0	$ 0.0	0.0	37.6	0.0
Other comprehensive income (loss)		(1.9)		0.0	0.0	0.0	0.0	(1.9)
Adoption of ASU 2016-13 | Adoption of ASU 2016-13	[1]	0.0
Share-based compensation		8.9		0.0	0.0	8.9	0.0	0.0
Issuance of share-based awards, net of withholdings and other		(2.0)		$ 0.0	$ (1.8)	(0.2)	0.0	0.0
Issuance of share-based awards, net of withholdings and other (in shares)				0.3	0.2
Balance at Dec. 31, 2019		268.6		$ 0.3	$ (4.2)	225.2	131.9	(84.6)
Balance (in shares) at Dec. 31, 2019				34.5	0.3
Net (loss) earnings		(25.9)		$ 0.0	$ 0.0	0.0	(25.9)	0.0
Other comprehensive income (loss)		3.8		0.0	0.0	0.0		3.8
Adoption of ASU 2016-13 | Adoption of ASU 2016-13		(0.5)	[1]	0.0	0.0	0.0	(0.5)	0.0
Share-based compensation		13.6		0.0	0.0	13.6	0.0	0.0
Common stock repurchases		(10.3)		$ 0.0	$ (10.3)	0.0	0.0	0.0
Common stock repurchases, shares				0.0	1.1
Issuance of share-based awards, net of withholdings and other		(1.5)		$ 0.0	$ (1.5)	0.0	0.0	0.0
Issuance of share-based awards, net of withholdings and other (in shares)				0.4	0.2
Balance at Dec. 31, 2020		$ 247.8		$ 0.3	$ (16.0)	238.8	105.5	(80.8)
Balance (in shares) at Dec. 31, 2020		34.9		34.9	1.6
Net (loss) earnings		$ 145.9		$ 0.0	$ 0.0	0.0	145.9	0.0
Other comprehensive income (loss)		2.5		0.0	0.0	0.0	0.0	2.5
Adoption of ASU 2016-13 | Adoption of ASU 2016-13	[1]	0.0
Share-based compensation		19.5		0.0	0.0	19.5	0.0	0.0
Common stock repurchases		(32.4)		$ 0.0	$ (32.4)	0.0	0.0	0.0
Common stock repurchases, shares				0.0	1.0
Issuance of share-based awards, net of withholdings and other		(6.3)		$ 0.1	$ (8.7)	2.3	0.0	0.0
Issuance of share-based awards, net of withholdings and other (in shares)				1.0	0.3
Balance at Dec. 31, 2021		$ 377.0		$ 0.4	$ (57.1)	$ 260.6	$ 251.4	$ (78.3)
Balance (in shares) at Dec. 31, 2021		35.9		35.9	2.9

[1] On January 1, 2020, the Company adopted ASU 2016-13, Financial Instruments - Credit Losses (Topic 326) Measurement of Credit Losses on Financial Instruments, and recorded a $0.5 million cumulative-effect adjustment to retained earnings.