Condensed Consolidated Statements of Changes in Stockholders' Equity (UNAUDITED) - 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, 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 earnings	4.1	$ 0.0	$ 0.0	0.0	4.1	0.0
Other comprehensive (loss) income	(2.2)	0.0	0.0	0.0	0.0	(2.2)
Adoption of ASU 2016-13 | Accounting Standards Update 2016-13	(0.5)	0.0	0.0	0.0	(0.5)	0.0
Share-based compensation	2.3	0.0	0.0	2.3	0.0	0.0
Common stock repurchases	(3.8)	0.0	$ (3.8)	0.0	0.0	0.0
Common stock repurchases, shares			(0.6)
Issuance of share-based awards, net of withholdings and other	(1.4)	$ 0.0	$ (1.4)	0.0	0.0	0.0
Issuance of share-based awards, net of withholdings and other (in shares)		0.3	0.1
Balance at Mar. 31, 2020	267.1	$ 0.3	$ (9.4)	227.5	135.5	(86.8)
Balance (in shares) at Mar. 31, 2020		34.8	1.0
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 earnings	$ 35.2	$ 0.0	$ 0.0	0.0	35.2	0.0
Other comprehensive (loss) income	1.5	0.0	0.0	0.0	0.0	1.5
Adoption of ASU 2016-13 | Accounting Standards Update 2016-13	0.0
Share-based compensation	3.1	0.0	0.0	3.1	0.0	0.0
Common stock repurchases	(3.4)	0.0	$ (3.4)	0.0	0.0	0.0
Common stock repurchases, shares			(0.1)
Issuance of share-based awards, net of withholdings and other	(8.2)	$ 0.1	$ (8.3)	0.0	0.0	0.0
Issuance of share-based awards, net of withholdings and other (in shares)		0.7	0.3
Balance at Mar. 31, 2021	$ 276.0	$ 0.4	$ (27.7)	$ 241.9	$ 140.7	$ (79.3)
Balance (in shares) at Mar. 31, 2021	35.6	35.6	2.0