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FAIR VALUE MEASUREMENTS AND THE FAIR VALUE OPTION - Schedule of Changes in Level 3 Investments (Details) - Level 3 - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Change in unrealized gain (losses) on level 3 investments $ 120.8 $ 195.3  
Equity Method Investments | Recurring      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning balance 1,794.8 1,136.5 $ 1,099.3
Unrealized and realized gains, including performance allocations 274.4 390.0 109.8
Unrealized and realized losses (114.1) (5.0) (13.5)
Contributions 348.1 273.8 109.2
Distributions (188.9) (144.3) (189.7)
Foreign exchange (55.8) (28.4) 24.5
Other 35.2 172.2 (3.1)
Ending balance $ 2,093.7 $ 1,794.8 $ 1,136.5