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INVESTMENTS - Narrative (Details) € in Millions, $ in Millions | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2020 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2021 EUR (€) | Oct. 31, 2020 segment
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |  |  |
Net unrealized gains on T. Rowe Price investments product recognized in nonoperating income |  | $ 63.6 | $ 142.7 | $ 105.4 |  |
Number of equity method investments | segment |  |  |  |  |  | 1
Seed capital |  |  |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |  |  |
Dividend distribution |  | 90.2 | $ 50.8 | $ 50.6 |  |
Investment in UTI Asset Management Company Limited (India) |  |  |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |  |  |
Equity method investment (ownership percentage) | 26.00% |  | 26.00% |  |  | 23.00%
Gain on sale of equity investments | $ 2.8 |  |  |  |  |
Investments in Affiliated Private Investment Funds |  |  |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |  |  |
Long-term investments |  | 761.1 |  |  |  |
European Collateralized Loan Obligations |  |  |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |  |  |
Secured debt |  | 129.9 |  |  |  |
Investments in affiliated collateralized loan obligations |  |  |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |  |  |
Secured debt |  | $ 36.9 |  |  | € 32.4 |
Percentage of interest expense |  | 0.50% |  |  | 0.50% |
Investments in affiliated collateralized loan obligations | Accounts Payable and Accrued Liabilities |  |  |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |  |  |
Debt assumed |  | $ 113.5 |  |  |  |
Investments in affiliated collateralized loan obligations | Euro Interbank Offer Rate (EURIBOR) | Minimum |  |  |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |  |  |
Investment interest rate |  | 1.70% |  |  | 1.70% |
Investments in affiliated collateralized loan obligations | Euro Interbank Offer Rate (EURIBOR) | Maximum |  |  |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |  |  |
Investment interest rate |  | 1.95% |  |  | 1.95% |
Investments in affiliated 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 | Repurchase Agreements |  |  |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |  |  |
Secured debt, repurchase agreements |  | $ 75.9 |  |  | € 66.7 |

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