INCOME TAXES - Summary of Provision for Federal and Foreign Income Tax Expense for Continuing Operations (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Income Taxes [Line Items]
U.S	$ 173.3	$ 151.4	$ (286.9)
Foreign	79.5	70.0	21.9
(Loss) income before income taxes	252.8	221.4	(265.0)
CUSA
Income Taxes [Line Items]
U.S	188.8	167.0	(263.7)
Foreign	79.5	70.0	21.9
(Loss) income before income taxes	$ 268.3	$ 237.0	$ (241.8)