ACCRUED OTHER CURRENT LIABILITIES - Schedule of Accrued Other Current Liabilities (Parenthetical) (Detail) - USD ($) $ in Millions		Dec. 31, 2024	Dec. 31, 2023
Payables and Accruals [Abstract]
Accrued other current liabilities, including accounts payable to subsidiaries	[1]	$ 270.0	$ 239.2
Additional gap amount		$ 0.3	$ 0.1

[1] The only difference between accrued other current liabilities for Holdings, as presented above, and CUSA is an additional $0.1 and $0.3 in “Other” as of December 31, 2023 and 2024, respectively.