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INVESTMENTS - Narrative (Details) € in Millions, $ in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2023 USD ($) | Sep. 30, 2022 USD ($) | Sep. 30, 2023 USD ($) | Sep. 30, 2022 USD ($) | Sep. 30, 2023 EUR (€) | Dec. 31, 2022 USD ($) | Dec. 31, 2022 EUR (€)
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |  |  |  |
Net unrealized gains (losses) on T. Rowe Price investments product recognized in nonoperating income | $ (46.1) | $ (35.3) | $ 28.9 | $ (258.7) |  |  |
Investments in affiliated collateralized loan obligations |  |  |  |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |  |  |  |
Secured debt | $ 26.6 |  | $ 26.6 |  | € 25.2 | $ 31.7 | € 25.2
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% |  | 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 | 12.52% |  | 12.52% |  | 12.52% |  |
Investments in affiliated collateralized loan obligations | Repurchase Agreements |  |  |  |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |  |  |  |
Secured debt, repurchase agreements | $ 69.5 |  | $ 69.5 |  | € 65.7 | 71.3 | € 65.7
Investments in affiliated collateralized loan obligations | Accounts Payable and Accrued Liabilities |  |  |  |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |  |  |  |
Debt assumed | $ 96.1 |  | $ 96.1 |  |  | $ 103.0 |

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