INTANGIBLE ASSETS - Schedule of Finite-Lived Intangible Assets by Major Class (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Finite-Lived Intangible Assets [Line Items]
Gross Book Value	$ 7,474.0	$ 7,463.3
Accumulated Amortization and Impairment	(1,625.9)	(322.1)
Net Book Value	5,848.1	7,141.2
Indefinite-lived intangible assets	19.1	19.1
Management contracts
Finite-Lived Intangible Assets [Line Items]
Gross Book Value	318.3	318.3
Accumulated Amortization and Impairment	(221.5)	(189.2)
Net Book Value	96.8	129.1
Developed technology
Finite-Lived Intangible Assets [Line Items]
Gross Book Value	94.2	90.5
Accumulated Amortization and Impairment	(91.4)	(78.8)
Net Book Value	2.8	11.7
Other
Finite-Lived Intangible Assets [Line Items]
Gross Book Value	107.2	104.8
Accumulated Amortization and Impairment	(64.1)	(54.1)
Net Book Value	43.1	50.7
Management contracts
Finite-Lived Intangible Assets [Line Items]
Gross Book Value	6,954.3
Gross Book Value	5,705.4	$ 6,949.7
Accumulated Amortization and Impairment	$ (1,248.9)