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FAIR VALUE MEASUREMENTS - Schedule of Fair Value Measurements (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Contingent consideration liability | $ 0.0 | $ 13.4
Discretionary investments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
T. Rowe Price investment products | 261.0 | 246.4
Seed capital |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
T. Rowe Price investment products | 297.6 | 247.8
Supplemental savings plan liability economic hedges |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
T. Rowe Price investment products | 901.9 | 806.6
Level 1 | Fair value, measurements, recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash equivalents held in money market funds | 2,735.3 | 1,678.1
Other investments | 0.1 | 0.7
Investments in affiliated collateralized loan obligations | 0.0 | 0.0
Total | 4,138.4 | 2,937.8
Contingent consideration liability | 0.0 | 0.0
Level 1 | Fair value, measurements, recurring | Discretionary investments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
T. Rowe Price investment products | 261.0 | 246.4
Level 1 | Fair value, measurements, recurring | Seed capital |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
T. Rowe Price investment products | 240.1 | 206.0
Level 1 | Fair value, measurements, recurring | Supplemental savings plan liability economic hedges |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
T. Rowe Price investment products | 901.9 | 806.6
Level 2 | Fair value, measurements, recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash equivalents held in money market funds | 0.0 | 0.0
Other investments | 0.0 | 0.0
Investments in affiliated collateralized loan obligations | 7.6 | 8.4
Total | 65.1 | 50.2
Contingent consideration liability | 0.0 | 0.0
Level 2 | Fair value, measurements, recurring | Discretionary investments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
T. Rowe Price investment products | 0.0 | 0.0
Level 2 | Fair value, measurements, recurring | Seed capital |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
T. Rowe Price investment products | 57.5 | 41.8
Level 2 | Fair value, measurements, recurring | Supplemental savings plan liability economic hedges |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
T. Rowe Price investment products | 0.0 | 0.0
Level 3 | Fair value, measurements, recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash equivalents held in money market funds | 0.0 | 0.0
Other investments | 42.2 | 0.0
Investments in affiliated collateralized loan obligations | 0.0 | 0.0
Total | 42.2 | 0.0
Contingent consideration liability | $ 0.0 | 13.4
Measurement input | 8.90% |
Level 3 | Fair value, measurements, recurring | Discretionary investments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
T. Rowe Price investment products | $ 0.0 | 0.0
Level 3 | Fair value, measurements, recurring | Seed capital |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
T. Rowe Price investment products | 0.0 | 0.0
Level 3 | Fair value, measurements, recurring | Supplemental savings plan liability economic hedges |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
T. Rowe Price investment products | $ 0.0 | $ 0.0

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