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INVESTMENTS - Total Assets, Liabilities and Non-controlling Interests (Details) - USD ($)
$ in Millions
Mar. 31, 2022
Dec. 31, 2021
Subsidiary or Equity Method Investee [Line Items]    
Assets $ 12,348.0 $ 12,509.0
Liabilities 2,231.0 2,255.3
Non-controlling interest 272.2 248.7
Variable interest entities    
Subsidiary or Equity Method Investee [Line Items]    
Assets 695.4 692.7
Liabilities 1.1 56.4
Non-controlling interest $ 272.2 $ 248.7