CONSOLIDATED INVESTMENT PRODUCTS - Operating Results (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Condensed Income Statements, Captions [Line Items]
Operating expenses reflected in net operating income	$ (1,250.3)	$ (1,172.0)	$ (3,662.9)	$ (3,504.2)
Income before income taxes	881.6	826.1	2,262.4	2,246.6
Net income (loss) attributable to redeemable non-controlling interests	40.4	37.4	105.9	58.9
Consolidated T. Rowe Price investment products
Condensed Income Statements, Captions [Line Items]
Income before income taxes	70.4	83.5	176.0	159.4
Net income (loss) attributable to T. Rowe Price Group, Inc.	30.0	46.1	70.1	100.5
Net income (loss) attributable to redeemable non-controlling interests	40.4	37.4	105.9	58.9
Consolidated T. Rowe Price investment products | Reportable entities
Condensed Income Statements, Captions [Line Items]
Operating expenses reflected in net operating income	(2.2)	(2.4)	(7.1)	(7.3)
Net investment income (loss) reflected in non-operating income (loss)	72.6	85.9	183.1	166.7
Income before income taxes	70.4	83.5	176.0	159.4
Voting interest entities
Condensed Income Statements, Captions [Line Items]
Income before income taxes	7.0	26.8	24.2	55.0
Net income (loss) attributable to T. Rowe Price Group, Inc.	5.4	19.2	17.8	42.0
Net income (loss) attributable to redeemable non-controlling interests	1.6	7.6	6.4	13.0
Voting interest entities | Reportable entities
Condensed Income Statements, Captions [Line Items]
Operating expenses reflected in net operating income	(0.1)	(0.5)	(0.4)	(2.0)
Net investment income (loss) reflected in non-operating income (loss)	7.1	27.3	24.6	57.0
Income before income taxes	7.0	26.8	24.2	55.0
Variable interest entities
Condensed Income Statements, Captions [Line Items]
Income before income taxes	63.4	56.7	151.8	104.4
Net income (loss) attributable to T. Rowe Price Group, Inc.	24.6	26.9	52.3	58.5
Net income (loss) attributable to redeemable non-controlling interests	38.8	29.8	99.5	45.9
Variable interest entities | Reportable entities
Condensed Income Statements, Captions [Line Items]
Operating expenses reflected in net operating income	(2.1)	(1.9)	(6.7)	(5.3)
Net investment income (loss) reflected in non-operating income (loss)	65.5	58.6	158.5	109.7
Income before income taxes	$ 63.4	$ 56.7	$ 151.8	$ 104.4