RELATED PARTY TRANSACTIONS - Expenses (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Related Party Transaction [Line Items]
Total expenses	$ 1,896.1	$ 1,652.2	$ 5,376.2	$ 4,837.8
Related Party
Related Party Transaction [Line Items]
Total expenses	8.5	14.2	35.4	38.4
Dofcon | Related Party
Related Party Transaction [Line Items]
Total expenses	6.8	6.3	20.1	12.4
Others | Related Party
Related Party Transaction [Line Items]
Total expenses	$ 1.7	$ 7.9	$ 15.3	$ 26.0