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INVESTMENTS - Narrative (Details)
€ in Millions, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2022
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2022
USD ($)
Jun. 30, 2021
USD ($)
Jun. 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 $ (131.2) $ 49.5 $ (225.5) $ 88.3      
Investments in affiliated collateralized loan obligations              
Debt and Equity Securities, FV-NI [Line Items]              
Secured debt $ 32.4   $ 32.4   € 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 1.70%   1.70%   1.70%    
Investments in affiliated collateralized loan obligations | Maximum | Euro Interbank Offer Rate (EURIBOR)              
Debt and Equity Securities, FV-NI [Line Items]              
Investment interest rate 1.95%   1.95%   1.95%    
Investments in affiliated collateralized loan obligations | Repurchase Agreements              
Debt and Equity Securities, FV-NI [Line Items]              
Secured debt, repurchase agreements $ 69.9   $ 69.9   € 66.7 75.9 € 66.7
Investments in affiliated collateralized loan obligations | Accounts Payable and Accrued Liabilities              
Debt and Equity Securities, FV-NI [Line Items]              
Debt assumed $ 102.3   $ 102.3     $ 113.5