CONSOLIDATED T. ROWE PRICE INVESTMENT PRODUCTS AND OTHER ENTITIES - Operating Results (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Condensed Income Statements, Captions [Line Items]
Operating expenses reflected in net operating income	$ (844.4)	$ (971.2)	$ (1,830.0)	$ (1,904.8)
Income before income taxes	388.7	1,102.0	1,067.6	2,097.3
Net income (loss) attributable to redeemable non-controlling interests	(51.8)	27.0	(105.3)	42.4
Consolidated T. Rowe Price investment products
Condensed Income Statements, Captions [Line Items]
Income before income taxes	(106.5)	52.7	(210.4)	86.4
Net income (loss) attributable to T. Rowe Price	(54.7)	25.7	(105.1)	44.0
Net income (loss) attributable to redeemable non-controlling interests	(51.8)	27.0	(105.3)	42.4
Consolidated T. Rowe Price investment products \| Reportable entities
Condensed Income Statements, Captions [Line Items]
Operating expenses reflected in net operating income	(1.9)	(2.8)	(4.4)	(6.3)
Net investment income (loss) reflected in non-operating income (loss)	(104.6)	55.5	(206.0)	92.7
Income before income taxes	(106.5)	52.7	(210.4)	86.4
Voting interest entities
Condensed Income Statements, Captions [Line Items]
Income before income taxes	(8.2)	7.2	(15.0)	13.1
Net income (loss) attributable to T. Rowe Price	(5.6)	4.3	(10.3)	8.3
Net income (loss) attributable to redeemable non-controlling interests	(2.6)	2.9	(4.7)	4.8
Voting interest entities \| Reportable entities
Condensed Income Statements, Captions [Line Items]
Operating expenses reflected in net operating income	(0.1)	(0.1)	(0.3)	(0.3)
Net investment income (loss) reflected in non-operating income (loss)	(8.1)	7.3	(14.7)	13.4
Income before income taxes	(8.2)	7.2	(15.0)	13.1
Variable interest entities
Condensed Income Statements, Captions [Line Items]
Income before income taxes	(98.3)	45.5	(195.4)	73.3
Net income (loss) attributable to T. Rowe Price	(49.1)	21.4	(94.8)	35.7
Net income (loss) attributable to redeemable non-controlling interests	(49.2)	24.1	(100.6)	37.6
Variable interest entities \| Reportable entities
Condensed Income Statements, Captions [Line Items]
Operating expenses reflected in net operating income	(1.8)	(2.7)	(4.1)	(6.0)
Net investment income (loss) reflected in non-operating income (loss)	(96.5)	48.2	(191.3)	79.3
Income before income taxes	$ (98.3)	$ 45.5	$ (195.4)	$ 73.3

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