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INVESTMENTS - Narrative (Details) € in Millions, $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2025 USD ($) | Mar. 31, 2024 USD ($) | Mar. 31, 2025 EUR (€) | Dec. 31, 2024 USD ($) | Dec. 31, 2024 EUR (€)
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |  |
Net unrealized (loss) gain on T. Rowe Price investments product recognized in nonoperating income | $ (27.3) | $ 64.5 |  |  |
Investments in affiliated collateralized loan obligations |  |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |  |
Secured debt, repurchase agreements | $ 44.5 |  | € 41.2 | $ 59.1 | € 56.9
Investments in affiliated collateralized loan obligations | Minimum |  |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |  |
Investment interest rate | 1.15% |  | 1.15% |  |
Investments in affiliated collateralized loan obligations | Maximum |  |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |  |
Investment interest rate | 11.61% |  | 11.61% |  |

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