INVESTMENTS - Details of Company Investments, Current (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Schedule of Investments [Line Items]
Equity method investments	$ 631.8	$ 621.2
Foreign time deposits	0.0	25.7
Other	14.9	24.7
Total investments	919.1	996.6
Other equity securities
Schedule of Investments [Line Items]
Equity investments	0.0	1.0
Seed capital
Schedule of Investments [Line Items]
Equity investments	75.7	177.9
Investments related to deferred compensation plans
Schedule of Investments [Line Items]
Equity investments	$ 196.7	$ 146.1