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INVESTMENTS - Narrative (Details)
€ in Millions, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2022
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2022
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2022
EUR (€)
Dec. 31, 2021
USD ($)
Dec. 31, 2021
EUR (€)
Debt and Equity Securities, FV-NI [Line Items]              
Net unrealized (loss) gain on T. Rowe Price investments product recognized in nonoperating income $ (35.3) $ (4.6) $ (258.7) $ 83.7      
Investments in affiliated collateralized loan obligations              
Debt and Equity Securities, FV-NI [Line Items]              
Secured debt $ 29.2   $ 29.2   € 35.6 $ 36.9 € 35.6
Investments in affiliated collateralized loan obligations | Minimum | Euro Interbank Offer Rate (EURIBOR)              
Debt and Equity Securities, FV-NI [Line Items]              
Investment interest rate 1.75%   1.75%   1.75%    
Investments in affiliated collateralized loan obligations | Maximum | Euro Interbank Offer Rate (EURIBOR)              
Debt and Equity Securities, FV-NI [Line Items]              
Investment interest rate 2.00%   2.00%   2.00%    
Investments in affiliated collateralized loan obligations | Repurchase Agreements              
Debt and Equity Securities, FV-NI [Line Items]              
Secured debt, repurchase agreements $ 65.4   $ 65.4   € 66.8 75.9 € 66.8
Investments in affiliated collateralized loan obligations | Accounts Payable and Accrued Liabilities              
Debt and Equity Securities, FV-NI [Line Items]              
Debt assumed $ 94.6   $ 94.6     $ 113.5