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CONSOLIDATED T. ROWE PRICE INVESTMENT PRODUCTS. (Operating Results) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Condensed Income Statements, Captions [Line Items]
Operating expenses reflected in net operating income									$ (3,011.2)	$ (2,746.1)	$ (2,551.4)
Income before income taxes									2,384.6	2,505.1	1,960.5
Less: net income (loss) attributable to redeemable non-controlling interests									(68.8)	83.4	39.0
Investment advisory and administrative fees	$ (1,305.0)	$ (1,394.6)	$ (1,345.0)	$ (1,328.0)	$ (1,297.6)	$ (1,238.7)	$ (1,186.0)	$ (1,132.6)	(5,372.6)	(4,854.9)	(4,284.8)
Consolidation eliminations [Member]
Condensed Income Statements, Captions [Line Items]
Operating expenses reflected in net operating income									6.2	5.6	6.5
Investment advisory and administrative fees									6.2	5.6	6.5
Consolidated T. Rowe Price investment products [Member]
Condensed Income Statements, Captions [Line Items]
Income before income taxes									(105.6)	181.6	108.1
Net income (loss) attributable to T. Rowe Price Group									(36.8)	98.2	69.1
Less: net income (loss) attributable to redeemable non-controlling interests									(68.8)	83.4	39.0
Consolidated T. Rowe Price investment products [Member] | Reportable entities [Member]
Condensed Income Statements, Captions [Line Items]
Operating expenses reflected in net operating income									(12.7)	(12.3)	(13.0)
Net investment income (loss) reflected in non-operating income									(92.9)	193.9	121.1
Income before income taxes									(105.6)	181.6	108.1
Voting interest entities [Member]
Condensed Income Statements, Captions [Line Items]
Income before income taxes									(18.6)	17.7	20.9
Net income (loss) attributable to T. Rowe Price Group									(6.3)	13.3	15.0
Less: net income (loss) attributable to redeemable non-controlling interests									(12.3)	4.4	5.9
Voting interest entities [Member] | Reportable entities [Member]
Condensed Income Statements, Captions [Line Items]
Operating expenses reflected in net operating income									(1.9)	(1.1)	(1.6)
Net investment income (loss) reflected in non-operating income									(16.7)	18.8	22.5
Income before income taxes									(18.6)	17.7	20.9
Variable interest entities [Member]
Condensed Income Statements, Captions [Line Items]
Income before income taxes									(87.0)	163.9	87.2
Net income (loss) attributable to T. Rowe Price Group									(30.5)	84.9	54.1
Less: net income (loss) attributable to redeemable non-controlling interests									(56.5)	79.0	33.1
Variable interest entities [Member] | Reportable entities [Member]
Condensed Income Statements, Captions [Line Items]
Operating expenses reflected in net operating income									(10.8)	(11.2)	(11.4)
Net investment income (loss) reflected in non-operating income									(76.2)	175.1	98.6
Income before income taxes									$ (87.0)	$ 163.9	$ 87.2

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