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INVESTMENTS - Total Assets, Liabilities and Non-controlling Interests (Details) - USD ($)
$ in Millions
Mar. 31, 2023
Dec. 31, 2022
Subsidiary or Equity Method Investee [Line Items]    
Assets $ 12,156.6 $ 11,643.3
Liabilities 2,082.7 1,956.4
Non-controlling interest 194.4 190.7
Variable interest entities    
Subsidiary or Equity Method Investee [Line Items]    
Assets 529.1 526.2
Liabilities 1.7 15.8
Non-controlling interest $ 194.4 $ 190.7