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INVESTMENTS - Total Assets, Liabilities and Non-controlling Interests (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Subsidiary or Equity Method Investee [Line Items]    
Assets $ 14,730.4 $ 13,472.0
Liabilities 2,761.0 2,021.9
Non-controlling interest 170.0 160.7
Variable interest entities    
Subsidiary or Equity Method Investee [Line Items]    
Assets 455.9 467.7
Liabilities $ 0.8 $ 0.4