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INVESTMENTS - Total Assets, Liabilities and Non-controlling Interests (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Subsidiary or Equity Method Investee [Line Items]    
Assets $ 12,278.8 $ 11,643.3
Liabilities 1,987.6 1,956.4
Non-controlling interest 192.0 190.7
VIE    
Subsidiary or Equity Method Investee [Line Items]    
Assets 564.7 526.2
Liabilities $ 1.9 $ 15.8