DEBT - Schedule of Outstanding Letters of Credit and the Unused Portion of Senior Credit Facility (Detail) - Senior credit facility - Line of credit - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Outstanding letters of credit under Credit Facility	$ 59.0	$ 60.1
Unused portion of the Credit Facility	$ 1,095.8	$ 985.7