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CONSOLIDATED T. ROWE PRICE INVESTMENT PRODUCTS. (Operating Results) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Condensed Income Statements, Captions [Line Items]
Operating expenses reflected in net operating income									$ (3,230.9)	$ (3,011.2)	$ (2,746.1)
Income before income taxes									2,927.3	2,384.6	2,505.1
Net income (loss) attributable to redeemable non-controlling interests									117.6	(68.8)	83.4
Investment advisory and administrative fees	$ (1,468.7)	$ (1,426.7)	$ (1,395.2)	$ (1,327.3)	$ (1,305.0)	$ (1,394.6)	$ (1,345.0)	$ (1,328.0)	(5,617.9)	(5,372.6)	(4,854.9)
Consolidation eliminations
Condensed Income Statements, Captions [Line Items]
Operating expenses reflected in net operating income									(6.8)	6.2	5.6
Investment advisory and administrative fees									6.8	6.2	5.6
Consolidated T. Rowe Price investment products
Condensed Income Statements, Captions [Line Items]
Income before income taxes									258.2	(105.6)	181.6
Net income (loss) attributable to T. Rowe Price Group									140.6	(36.8)	98.2
Net income (loss) attributable to redeemable non-controlling interests									117.6	(68.8)	83.4
Consolidated T. Rowe Price investment products | Reportable entities
Condensed Income Statements, Captions [Line Items]
Operating expenses reflected in net operating income									(14.7)	(12.7)	(12.3)
Net gains (losses) reflected in non-operating income									272.9	(92.9)	193.9
Income before income taxes									258.2	(105.6)	181.6
VOE
Condensed Income Statements, Captions [Line Items]
Income before income taxes									28.8	(18.6)	17.7
Net income (loss) attributable to T. Rowe Price Group									21.3	(6.3)	13.3
Net income (loss) attributable to redeemable non-controlling interests									7.5	(12.3)	4.4
VOE | Reportable entities
Condensed Income Statements, Captions [Line Items]
Operating expenses reflected in net operating income									(2.2)	(1.9)	(1.1)
Net gains (losses) reflected in non-operating income									31.0	(16.7)	18.8
Income before income taxes									28.8	(18.6)	17.7
VIE
Condensed Income Statements, Captions [Line Items]
Income before income taxes									229.4	(87.0)	163.9
Net income (loss) attributable to T. Rowe Price Group									119.3	(30.5)	84.9
Net income (loss) attributable to redeemable non-controlling interests									110.1	(56.5)	79.0
VIE | Reportable entities
Condensed Income Statements, Captions [Line Items]
Operating expenses reflected in net operating income									(12.5)	(10.8)	(11.2)
Net gains (losses) reflected in non-operating income									241.9	(76.2)	175.1
Income before income taxes									$ 229.4	$ (87.0)	$ 163.9

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