RELATED PARTY TRANSACTIONS - Expenses (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Related Party Transaction [Line Items]
Total expenses	$ 1,813.7	$ 1,640.2	$ 3,480.1	$ 3,185.6
Related Party
Related Party Transaction [Line Items]
Total expenses	16.0	16.5	26.9	24.2
Dofcon | Related Party
Related Party Transaction [Line Items]
Total expenses	4.7	3.0	13.3	6.1
Others | Related Party
Related Party Transaction [Line Items]
Total expenses	$ 11.3	$ 13.5	$ 13.6	$ 18.1