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CONSOLIDATED T. ROWE PRICE INVESTMENT PRODUCTS. (Operating Results) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Condensed Income Statements, Captions [Line Items]
Operating expenses reflected in net operating income	$ (933.6)	$ (755.4)
Income before income taxes	995.3	206.9
Net income (loss) attributable to redeemable non-controlling interests	15.4	(176.5)
Consolidated T. Rowe Price investment products
Condensed Income Statements, Captions [Line Items]
Income before income taxes	33.7	(334.0)
Net income (loss) attributable to T. Rowe Price Group	18.3	(157.5)
Net income (loss) attributable to redeemable non-controlling interests	15.4	(176.5)
Voting interest entities
Condensed Income Statements, Captions [Line Items]
Income before income taxes	5.9	(35.4)
Net income (loss) attributable to T. Rowe Price Group	4.0	(22.6)
Net income (loss) attributable to redeemable non-controlling interests	1.9	(12.8)
Variable interest entities
Condensed Income Statements, Captions [Line Items]
Income before income taxes	27.8	(298.6)
Net income (loss) attributable to T. Rowe Price Group	14.3	(134.9)
Net income (loss) attributable to redeemable non-controlling interests	13.5	(163.7)
Reportable entities | Consolidated T. Rowe Price investment products
Condensed Income Statements, Captions [Line Items]
Operating expenses reflected in net operating income	(3.5)	(3.7)
Net investment income (loss) reflected in non-operating income (loss)	37.2	(330.3)
Income before income taxes	33.7	(334.0)
Reportable entities | Voting interest entities
Condensed Income Statements, Captions [Line Items]
Operating expenses reflected in net operating income	(0.2)	(0.2)
Net investment income (loss) reflected in non-operating income (loss)	6.1	(35.2)
Income before income taxes	5.9	(35.4)
Reportable entities | Variable interest entities
Condensed Income Statements, Captions [Line Items]
Operating expenses reflected in net operating income	(3.3)	(3.5)
Net investment income (loss) reflected in non-operating income (loss)	31.1	(295.1)
Income before income taxes	27.8	(298.6)
Consolidation eliminations
Condensed Income Statements, Captions [Line Items]
Operating expenses reflected in net operating income	$ (1.3)	$ (2.5)

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