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INVESTMENTS - Narrative (Details) € in Millions, $ in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($) | Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($) | Sep. 30, 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 | $ 44.3 | $ (46.1) | $ 129.3 | $ 28.9 |  |  |
Investments in affiliated collateralized loan obligations |  |  |  |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |  |  |  |
Debt assumed | 75.8 |  | 75.8 |  |  | $ 89.4 |
Secured debt, repurchase agreements | 66.3 |  | 66.3 |  | € 59.4 | 72.3 | € 59.4
Secured debt | $ 9.5 |  | $ 9.5 |  | € 8.5 | $ 17.1 | € 8.5
Investments in affiliated collateralized loan obligations | Minimum |  |  |  |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |  |  |  |
Investment interest rate | 1.15% |  | 1.15% |  | 1.15% |  |
Investments in affiliated collateralized loan obligations | Maximum |  |  |  |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |  |  |  |
Investment interest rate | 12.60% |  | 12.60% |  | 12.60% |  |

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