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INVESTMENTS - Narrative (Details) € in Millions, $ in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2022 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2022 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2022 EUR (€) | Dec. 31, 2021 USD ($) | Dec. 31, 2021 EUR (€)
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |  |  |  |
Net unrealized (loss) gain on T. Rowe Price investments product recognized in nonoperating income | $ (35.3) | $ (4.6) | $ (258.7) | $ 83.7 |  |  |
Investments in affiliated collateralized loan obligations |  |  |  |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |  |  |  |
Secured debt | $ 29.2 |  | $ 29.2 |  | € 35.6 | $ 36.9 | € 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 | 1.75% |  | 1.75% |  | 1.75% |  |
Investments in affiliated collateralized loan obligations | Maximum | Euro Interbank Offer Rate (EURIBOR) |  |  |  |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |  |  |  |
Investment interest rate | 2.00% |  | 2.00% |  | 2.00% |  |
Investments in affiliated collateralized loan obligations | Repurchase Agreements |  |  |  |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |  |  |  |
Secured debt, repurchase agreements | $ 65.4 |  | $ 65.4 |  | € 66.8 | 75.9 | € 66.8
Investments in affiliated collateralized loan obligations | Accounts Payable and Accrued Liabilities |  |  |  |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |  |  |  |
Debt assumed | $ 94.6 |  | $ 94.6 |  |  | $ 113.5 |

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