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CONSOLIDATED SPONSORED INVESTMENT PRODUCTS - Operating Results (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Condensed Income Statements, Captions [Line Items]
Operating expenses reflected in net operating income	$ (1,172.0)	$ (1,089.4)	$ (3,504.2)	$ (3,219.5)
Income before income taxes	826.1	584.1	2,246.6	1,843.4
Net income (loss) attributable to redeemable non-controlling interests	37.4	(14.0)	58.9	11.0
Consolidated T. Rowe Price investment products
Condensed Income Statements, Captions [Line Items]
Income before income taxes	83.5	(25.8)	159.4	36.6
Net income (loss) attributable to T. Rowe Price Group, Inc.	46.1	(11.8)	100.5	25.6
Net income (loss) attributable to redeemable non-controlling interests	37.4	(14.0)	58.9	11.0
Consolidated T. Rowe Price investment products | Reportable entities
Condensed Income Statements, Captions [Line Items]
Operating expenses reflected in net operating income	(2.4)	(1.4)	(7.3)	(8.8)
Net investment income (loss) reflected in non-operating income (loss)	85.9	(24.4)	166.7	45.4
Income before income taxes	83.5	(25.8)	159.4	36.6
Voting interest entities
Condensed Income Statements, Captions [Line Items]
Income before income taxes	26.8	(12.1)	55.0	(1.9)
Net income (loss) attributable to T. Rowe Price Group, Inc.	19.2	(8.6)	42.0	(0.5)
Net income (loss) attributable to redeemable non-controlling interests	7.6	(3.5)	13.0	(1.4)
Voting interest entities | Reportable entities
Condensed Income Statements, Captions [Line Items]
Operating expenses reflected in net operating income	(0.5)	(0.5)	(2.0)	(3.0)
Net investment income (loss) reflected in non-operating income (loss)	27.3	(11.6)	57.0	1.1
Income before income taxes	26.8	(12.1)	55.0	(1.9)
Variable interest entities
Condensed Income Statements, Captions [Line Items]
Income before income taxes	56.7	(13.7)	104.4	38.5
Net income (loss) attributable to T. Rowe Price Group, Inc.	26.9	(3.2)	58.5	26.1
Net income (loss) attributable to redeemable non-controlling interests	29.8	(10.5)	45.9	12.4
Variable interest entities | Reportable entities
Condensed Income Statements, Captions [Line Items]
Operating expenses reflected in net operating income	(1.9)	(0.9)	(5.3)	(5.8)
Net investment income (loss) reflected in non-operating income (loss)	58.6	(12.8)	109.7	44.3
Income before income taxes	$ 56.7	$ (13.7)	$ 104.4	$ 38.5

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