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INVESTMENTS - Total Assets, Liabilities and Non-controlling Interests (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Subsidiary or Equity Method Investee [Line Items]    
Assets $ 12,556.8 $ 11,643.3
Liabilities 2,375.2 1,956.4
Non-controlling interest 221.5 190.7
Variable interest entities    
Subsidiary or Equity Method Investee [Line Items]    
Assets 621.7 526.2
Liabilities $ 0.2 $ 15.8