FAIR VALUE MEASUREMENTS - Schedule of Fair Value Measurements (Details) - USD ($) $ in Millions | Mar. 31, 2023 | Dec. 31, 2022 |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Contingent consideration liability | $ 46.2 | $ 95.8 |
Discretionary investments | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
T. Rowe Price investment products | 244.2 | 242 |
Seed capital | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
T. Rowe Price investment products | 249.2 | 195.1 |
Supplemental savings plan liability economic hedges | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
T. Rowe Price investment products | 786.7 | 760.7 |
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 | 1,678.9 | 1,412 |
Other investments | 0.6 | 0.6 |
Investments in affiliated collateralized loan obligations | 0 | 0 |
Total | 2,916.9 | 2,576.3 |
Contingent consideration liability | 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 | 244.2 | 242 |
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 | 206.5 | 161 |
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 | 786.7 | 760.7 |
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 |
Other investments | 0 | 0.1 |
Investments in affiliated collateralized loan obligations | 7.2 | 6.4 |
Total | 49.9 | 40.6 |
Contingent consideration liability | 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 |
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 | 42.7 | 34.1 |
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 |
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 |
Other investments | 0 | 0 |
Investments in affiliated collateralized loan obligations | 0 | 0 |
Total | 0 | 0 |
Contingent consideration liability | 46.2 | 95.8 |
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 |
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 |
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 |