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INVESTMENTS - Narrative (Details) € in Millions, $ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2023 USD ($) | Jun. 30, 2022 USD ($) | Jun. 30, 2023 USD ($) | Jun. 30, 2022 USD ($) | Jun. 30, 2023 EUR (€) | Dec. 31, 2022 USD ($) | Dec. 31, 2022 EUR (€)
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |  |  |  |
Net unrealized (loss) gain on T. Rowe Price investments product recognized in nonoperating income | $ 28.3 | $ (131.2) | $ (75.0) | $ (225.5) |  |  |
Investments in affiliated collateralized loan obligations |  |  |  |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |  |  |  |
Secured debt | $ 28.3 |  | $ 28.3 |  | € 35.6 | $ 31.7 | € 35.6
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 | 12.07% |  | 12.07% |  | 12.07% |  |
Investments in affiliated collateralized loan obligations | Repurchase Agreements |  |  |  |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |  |  |  |
Secured debt, repurchase agreements | $ 71.7 |  | $ 71.7 |  | € 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 | $ 100.0 |  | $ 100.0 |  |  | $ 103.0 |

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