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INVESTMENTS - Narrative (Details) € in Millions, $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2024 EUR (€) | Dec. 31, 2023 EUR (€)
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |  |
Net unrealized gain (losses) on T. Rowe Price investments product recognized in nonoperating income | $ 51.3 | $ 86.7 | $ (240.5) |  |
Variable interest entity, not primary beneficiary |  |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |  |
Unfunded capital commitments | 202.5 | 94.1 |  |  |
Seed capital |  |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |  |
Dividend distribution | $ 67.6 | 38.2 | $ 45.3 |  |
Investments in European Collateralized Loan Obligations | Vertical Strip Investment |  |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |  |
Percentage of long term investments purchased | 5.00% |  |  | 5.00% |
Investments in affiliated collateralized loan obligations |  |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |  |
Debt assumed | $ 59.1 | 89.4 |  |  |
Secured debt, repurchase agreements | $ 59.1 | 72.3 |  | € 56.9 | € 65.5
Secured debt |  | $ 17.1 |  |  |
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 | 12.09% |  |  | 12.09% |

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