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, 2021	$ 377.0	$ 0.4	$ (57.1)	$ 260.6	$ 251.4	$ (78.3)
Balance (in shares) at Dec. 31, 2021		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 expense	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	4.4
Balance at Dec. 31, 2022	$ 329.5	$ 0.4	$ (221.8)	280.2	353.9	(83.2)
Balance (in shares) at Dec. 31, 2022	36.9	36.9	8.0
Net earnings	$ 15.8	$ 0.0	$ 0.0	0.0	15.8	0.0
Other comprehensive income	0.3	0.0	0.0	0.0	0.0	0.3
Share-based compensation expense	4.3	0.0	0.0	4.3	0.0	0.0
Common stock repurchases	(1.3)	$ 0.0	$ (1.3)	0.0	0.0	0.0
Common stock repurchases, shares		0.0	0.0
Issuance of share-based awards, net of withholdings and other	(15.9)	$ 0.0	$ (17.0)	1.1	0.0	0.0
Issuance of share-based awards, net of withholdings and other (in shares)		1.0	0.4
Balance at Mar. 31, 2023	$ 332.7	$ 0.4	$ (240.1)	$ 285.6	$ 369.7	$ (82.9)
Balance (in shares) at Mar. 31, 2023	37.9	37.9	8.4