INCOME TAXES - Summary of Provision for Federal and Foreign Income Tax Expense for Continuing Operations (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Taxes [Line Items]
U.S	$ 151.4	$ (286.9)	$ (389.2)
Foreign	70.0	21.9	(49.8)
Total	221.4	(265.0)	(439.0)
CUSA
Income Taxes [Line Items]
U.S	167.0	(263.7)	(362.6)
Foreign	70.0	21.9	(49.8)
Total	$ 237.0	$ (241.8)	$ (412.4)