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FAIR VALUE MEASUREMENTS AND THE FAIR VALUE OPTION - Schedule of Changes in Level 3 Investments (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Change in unrealized gain (losses) on level 3 investments $ 64.9 $ 9.5  
Equity Method Investments [Member]      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning balance 662.2 380.7 $ 356.7
Unrealized and realized gains 154.5 85.4 58.7
Unrealized and realized losses (27.1) (34.8) (1.1)
Contributions 199.3 335.9 59.9
Distributions (104.2) (76.3) (117.0)
Non-cash contributions (distributions), net 222.7 (28.7) 23.5
Ending Balance $ 1,107.4 $ 662.2 $ 380.7