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FAIR VALUE MEASUREMENTS - Summary of Investments (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Contingent consideration liability | $ 13.4 | $ 95.8
NAV Per Share |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
T. Rowe Price investment products | 69.0 | 86.4
Fair value, measurements, recurring | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash equivalents held in money market funds | 1,678.1 | 1,412.0
Other investments | 0.7 | 0.6
Investments in affiliated collateralized loan obligations | 0.0 | 0.0
Total | 2,937.8 | 2,576.3
Contingent consideration liability | 0.0 | 0.0
Fair value, measurements, recurring | Level 1 | Discretionary investments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
T. Rowe Price investment products | 246.4 | 242.0
Fair value, measurements, recurring | Level 1 | Seed capital |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
T. Rowe Price investment products | 206.0 | 161.0
Fair value, measurements, recurring | Level 1 | Supplemental savings plan liability economic hedges |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
T. Rowe Price investment products | 806.6 | 760.7
Fair value, measurements, recurring | Level 2 |  |
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 | 0.1
Investments in affiliated collateralized loan obligations | 8.4 | 6.4
Total | 50.2 | 40.6
Contingent consideration liability | 0.0 | 0.0
Fair value, measurements, recurring | Level 2 | Discretionary investments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
T. Rowe Price investment products | 0.0 | 0.0
Fair value, measurements, recurring | Level 2 | Seed capital |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
T. Rowe Price investment products | 41.8 | 34.1
Fair value, measurements, recurring | Level 2 | 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
Fair value, measurements, recurring | Level 3 |  |
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 | 0.0 | 0.0
Total | 0.0 | 0.0
Fair value, measurements, recurring | Level 3 | Discretionary investments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
T. Rowe Price investment products | 0.0 | 0.0
Fair value, measurements, recurring | Level 3 | Seed capital |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
T. Rowe Price investment products | 0.0 | 0.0
Fair value, measurements, recurring | Level 3 | 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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