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INVESTMENTS - Narrative (Details) € in Millions, $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2022 USD ($) | Mar. 31, 2021 USD ($) | Mar. 31, 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 | $ (99.9) | $ 38.8 |  |  |
Investments in affiliated collateralized loan obligations |  |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |  |
Secured debt | $ 34.9 |  | € 32.4 |  | € 36.9
Investments in affiliated collateralized loan obligations | Minimum | Euro Interbank Offer Rate (EURIBOR) |  |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |  |
Investment interest rate | 1.70% |  | 1.70% |  |
Investments in affiliated collateralized loan obligations | Maximum | Euro Interbank Offer Rate (EURIBOR) |  |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |  |
Investment interest rate | 1.95% |  | 1.95% |  |
Investments in affiliated collateralized loan obligations | Repurchase Agreements |  |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |  |
Secured debt, repurchase agreements | $ 73.8 |  | € 66.7 | $ 75.9 |
Investments in affiliated collateralized loan obligations | Accounts Payable and Accrued Liabilities |  |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |  |
Debt assumed | $ 108.7 |  |  | $ 113.5 |

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