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INVESTMENTS - Investments (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
U.S. Treasury note | $ 1.0 |  | $ 1.0 |  | $ 1.0
Total | 3,330.3 |  | 3,330.3 |  | 3,250.8
Net unrealized gains (losses) on T. Rowe Price investments product recognized in nonoperating income | (4.6) | $ 75.5 | 83.7 | $ 53.6 |
Gains recognized upon deconsolidation | (11.5) | 191.6 | 234.5 | 106.4 |
Reclassification out of accumulated other comprehensive income | Currency translation adjustments |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Gains recognized upon deconsolidation | 0.0 | 0.0 | 2.6 | 0.1 |
Assets |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Net increase (decrease) in assets, liabilities, and redeemable noncontrolling interest | 589.7 | (132.2) | (727.6) | (278.4) |
Liability |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Net increase (decrease) in assets, liabilities, and redeemable noncontrolling interest | 7.1 | (4.0) | (17.1) | (7.6) |
Redeemable noncontrolling interest |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Net increase (decrease) in assets, liabilities, and redeemable noncontrolling interest | 531.0 | $ (44.0) | (483.6) | $ (106.9) |
Discretionary investments |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Investments held at fair value | 1,610.2 |  | 1,610.2 |  | 1,647.7
Equity method investments | 254.1 |  | 254.1 |  | 242.9
Seed capital |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Investments held at fair value | 236.6 |  | 236.6 |  | 169.5
Equity method investments | 164.9 |  | 164.9 |  | 178.6
Supplemental savings plan liability economic hedges |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Investments held at fair value | 795.5 |  | 795.5 |  | 768.1
Investment partnerships and other investments |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Investments held at fair value | 108.6 |  | 108.6 |  | 95.1
23% investment in UTI Asset Management Company Limited (India) |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity method investments | $ 156.6 |  | $ 156.6 |  | $ 145.5
Equity method investment (ownership percentage) | 23.00% |  | 23.00% |  | 23.00%
Investment partnerships and other investments |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity method investments | $ 2.8 |  | $ 2.8 |  | $ 2.4

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