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INVESTMENTS - Total Assets, Liabilities and Non-controlling Interests (Details) - USD ($)
$ in Millions
Jun. 30, 2023
Dec. 31, 2022
Subsidiary or Equity Method Investee [Line Items]    
Assets $ 12,621.4 $ 11,643.3
Liabilities 2,170.3 1,956.4
Non-controlling interest 202.1 190.7
Variable interest entities    
Subsidiary or Equity Method Investee [Line Items]    
Assets 558.3 526.2
Liabilities 0.2 15.8
Non-controlling interest $ 202.1 $ 190.7