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INVESTMENTS - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Investments, Debt and Equity Securities [Abstract]        
Equity securities $ 2.2   $ 2.2  
Equity securities, unrealized gain 0.1   0.3  
Proceeds from sale of AFS securities 0.0   0.0  
Debt Securities, Available-for-Sale [Line Items]        
Equity method investments, unrealized gain (loss) $ 0.7 $ (0.7) $ 30.5 $ 0.1
PINE.L        
Debt Securities, Available-for-Sale [Line Items]        
Ownership percentage 25.50%   25.50%  
Equity method investment, fair value $ 105.4   $ 105.4  
LMMH        
Debt Securities, Available-for-Sale [Line Items]        
Ownership percentage 26.50%   26.50%  
Equity method investments $ 208.0   $ 208.0