INVESTMENTS - Details of Company Investments (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Schedule of Investments [Line Items]
Equity method investments	$ 669.5	$ 621.2
Foreign time deposits	15.1	25.7
Other	24.6	24.7
Total investments	992.1	996.6
Seed capital
Schedule of Investments [Line Items]
Equity investments	96.2	177.9
Investments related to deferred compensation plans
Schedule of Investments [Line Items]
Equity investments	185.8	146.1
Other equity securities
Schedule of Investments [Line Items]
Equity investments	$ 0.9	$ 1.0