INCOME TAXES - Summary of Current and Deferred Income Taxes (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Current:
Federal	$ 2.2	$ 1.9	$ 4.0
Foreign	14.2	9.2	0.8
State	2.9	1.2	1.0
Total current expense	19.3	12.3	5.8
Deferred:
Federal	15.8	(2.7)	(20.2)
Foreign	(5.7)	(2.4)	0.4
State	(0.5)	(4.2)	(2.8)
Total deferred taxes	10.6	(9.3)	(22.6)
Income taxes	29.9	3.0	(16.8)
CUSA
Current:
Federal	2.8	1.9	4.0
Foreign	14.2	9.2	0.8
State	2.9	1.2	1.0
Total current expense	19.9	12.3	5.8
Deferred:
Federal	13.8	(16.2)	(36.7)
Foreign	(5.7)	(2.4)	0.4
State	0.4	(6.8)	(1.8)
Total deferred taxes	8.5	(25.4)	(38.1)
Income taxes	$ 28.4	$ (13.1)	$ (32.3)