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FAIR VALUE MEASUREMENTS (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
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	$ 1,183.9	$ 1,931.1
Other investments	0.7	0.5
Total	2,826.2	4,504.0
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	518.7	1,647.7
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	241.4	156.6
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	881.5	768.1
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	0.1	0.6
Total	23.5	13.5
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	23.4	12.9
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
NAV Per Share
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
T. Rowe Price investment products	$ 108.1

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI), classified as current.

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Amount of investments classified as other.

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