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CONSOLIDATED T. ROWE PRICE INVESTMENT PRODUCTS - Operating Results (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Condensed Income Statements, Captions [Line Items]
Operating expenses reflected in net operating income	$ (957.9)	$ (866.9)	$ (2,862.7)	$ (2,484.0)
Income before income taxes	984.7	920.5	3,082.0	2,096.2
Net income (loss) attributable to redeemable non-controlling interests	(19.8)	55.4	22.6	4.4
Consolidation eliminations
Condensed Income Statements, Captions [Line Items]
Operating expenses reflected in net operating income	(1.6)	(2.7)	(4.0)	(7.3)
Consolidated T. Rowe Price investment products
Condensed Income Statements, Captions [Line Items]
Income before income taxes	(19.9)	96.8	66.5	1.6
Net income (loss) attributable to T. Rowe Price	(19.8)	41.4	22.6	4.4
Net income (loss) attributable to redeemable non-controlling interests	(0.1)	55.4	43.9	(2.8)
Consolidated T. Rowe Price investment products | Reportable entities
Condensed Income Statements, Captions [Line Items]
Operating expenses reflected in net operating income	(2.8)	(4.4)	(9.1)	(11.7)
Net investment income (loss) reflected in non-operating income (loss)	(17.1)	101.2	75.6	13.3
Income before income taxes	(19.9)	96.8	66.5	1.6
Voting interest entities
Condensed Income Statements, Captions [Line Items]
Income before income taxes	0.6	12.4	13.7	(6.9)
Net income (loss) attributable to T. Rowe Price	0.1	7.0	4.9	(4.2)
Net income (loss) attributable to redeemable non-controlling interests	0.5	5.4	8.8	(2.7)
Voting interest entities | Reportable entities
Condensed Income Statements, Captions [Line Items]
Operating expenses reflected in net operating income	(0.1)	(0.7)	(0.4)	(1.2)
Net investment income (loss) reflected in non-operating income (loss)	0.7	13.1	14.1	(5.7)
Income before income taxes	0.6	12.4	13.7	(6.9)
Variable interest entities
Condensed Income Statements, Captions [Line Items]
Income before income taxes	(20.5)	84.4	52.8	8.5
Net income (loss) attributable to T. Rowe Price	(19.9)	34.4	17.7	8.6
Net income (loss) attributable to redeemable non-controlling interests	(0.6)	50.0	35.1	(0.1)
Variable interest entities | Reportable entities
Condensed Income Statements, Captions [Line Items]
Operating expenses reflected in net operating income	(2.7)	(3.7)	(8.7)	(10.5)
Net investment income (loss) reflected in non-operating income (loss)	(17.8)	88.1	61.5	19.0
Income before income taxes	$ (20.5)	$ 84.4	$ 52.8	$ 8.5

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