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INVESTMENTS - Narrative (Details)
€ in Millions, $ in Millions
3 Months Ended
Mar. 31, 2023
USD ($)
Mar. 31, 2022
USD ($)
Mar. 31, 2023
EUR (€)
Dec. 31, 2022
USD ($)
Dec. 31, 2022
EUR (€)
Debt and Equity Securities, FV-NI [Line Items]          
Net unrealized (loss) gain on T. Rowe Price investments product recognized in nonoperating income $ 46.7 $ (99.9)      
Investments in affiliated collateralized loan obligations          
Debt and Equity Securities, FV-NI [Line Items]          
Secured debt $ 30.4   € 35.6 $ 31.7 € 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 1.15%   1.15%    
Investments in affiliated collateralized loan obligations | Maximum | Euro Interbank Offer Rate (EURIBOR)          
Debt and Equity Securities, FV-NI [Line Items]          
Investment interest rate 11.26%   11.26%    
Investments in affiliated collateralized loan obligations | Repurchase Agreements          
Debt and Equity Securities, FV-NI [Line Items]          
Secured debt, repurchase agreements $ 71.3   € 65.8 71.3 € 65.8
Investments in affiliated collateralized loan obligations | Accounts Payable and Accrued Liabilities          
Debt and Equity Securities, FV-NI [Line Items]          
Debt assumed $ 101.7     $ 103.0