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, 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	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
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	2.9
Net earnings	102.5	$ 0.0	$ 0.0	0.0	102.5	0.0
Other comprehensive income (loss)	(4.9)	0.0	0.0	0.0	0.0	(4.9)
Share-based compensation	19.3	0.0	0.0	19.3	0.0	0.0
Common stock repurchases	(152.5)	$ 0.0	$ (152.5)	0.0	0.0	0.0
Common stock repurchases, shares		0.0	4.7
Issuance of share-based awards, net of withholdings and other	(11.9)	$ 0.0	$ (12.2)	0.3	0.0	0.0
Issuance of share-based awards, net of withholdings and other (in shares)		1.0	0.4
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	$ 82.2	$ 0.0	$ 0.0	0.0	82.2	0.0
Other comprehensive income (loss)	5.3	0.0	0.0	0.0	0.0	5.3
Share-based compensation	22.5	0.0	0.0	22.5	0.0	0.0
Common stock repurchases	(22.6)	$ 0.0	$ (22.6)	0.0	0.0	0.0
Common stock repurchases, shares		0.0	0.5
Issuance of share-based awards, net of withholdings and other	(14.7)	$ 0.0	$ (17.7)	3.0	0.0	0.0
Issuance of share-based awards, net of withholdings and other (in shares)		1.1	0.4
Balance at Dec. 31, 2023	$ 402.2	$ 0.4	$ (262.1)	$ 305.7	$ 436.1	$ (77.9)
Balance (in shares) at Dec. 31, 2023	38.0	38.0	8.9