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INVESTMENTS - Total Assets, Liabilities and Non-controlling Interests (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Subsidiary or Equity Method Investee [Line Items]    
Assets $ 12,854.0 $ 12,278.8
Liabilities 2,187.8 1,987.6
Non-controlling interest 205.4 192.0
Variable interest entities    
Subsidiary or Equity Method Investee [Line Items]    
Assets 604.2 564.7
Liabilities $ 0.3 $ 1.9