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INVESTMENTS - Narrative (Details) € in Millions, $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2024 USD ($) | Mar. 31, 2023 USD ($) | Mar. 31, 2024 EUR (€) | Dec. 31, 2023 USD ($) | Dec. 31, 2023 EUR (€)
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |  |
Net unrealized (loss) gain on T. Rowe Price investments product recognized in nonoperating income | $ 64.5 | $ 46.7 |  |  |
Investments in affiliated collateralized loan obligations |  |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |  |
Secured debt, repurchase agreements | 69.3 |  | € 64.2 | $ 72.3 | € 64.2
Secured debt | $ 15.0 |  | € 13.9 | 17.1 | € 13.9
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 | 12.84% |  | 12.84% |  |
Investments in affiliated collateralized loan obligations | Accounts Payable and Accrued Liabilities |  |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |  |
Debt assumed | $ 84.3 |  |  | $ 89.4 |

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