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, 2020	$ 247.8	$ 0.3	$ (16.0)	$ 238.8	$ 105.5	$ (80.8)
Balance (in shares) at Dec. 31, 2020		34.9	1.6
Net earnings	35.2	$ 0.0	$ 0.0	0.0	35.2	0.0
Other comprehensive income	1.5	0.0	0.0	0.0	0.0	1.5
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		0.0	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	2.0
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
Net earnings	$ 26.4	$ 0.0	$ 0.0	0.0	26.4	0.0
Other comprehensive income	0.7	0.0	0.0	0.0	0.0	0.7
Share-based compensation	3.6	0.0	0.0	3.6	0.0	0.0
Common stock repurchases	(42.1)	$ 0.0	$ (42.1)	0.0	0.0	0.0
Common stock repurchases, shares		0.0	1.2
Issuance of share-based awards, net of withholdings and other	(11.7)	$ 0.0	$ (11.9)	0.2	0.0	0.0
Issuance of share-based awards, net of withholdings and other (in shares)		0.9	0.3
Balance at Mar. 31, 2022	$ 353.9	$ 0.4	$ (111.1)	$ 264.4	$ 277.8	$ (77.6)
Balance (in shares) at Mar. 31, 2022	36.8	36.8	4.4