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CONSOLIDATED T. ROWE PRICE INVESTMENT PRODUCTS. (Net Assets) (Details) - USD ($) $ in Millions	Sep. 30, 2019	Jun. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Dec. 31, 2017
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	$ 2,213.2		$ 1,425.2
Investments	2,605.9		2,453.4
Other assets	254.9		253.7
Total assets	9,397.8		7,689.3
Liabilities	1,455.1		824.7
Attributable to redeemable non-controlling interests	1,102.9	$ 1,012.3	740.3	$ 860.6	$ 739.2	$ 992.8
Consolidated T. Rowe Price investment products [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Net assets	2,167.0		1,641.7
Attributable to T. Rowe Price Group	1,064.1		901.4
Attributable to redeemable non-controlling interests	1,102.9		740.3
Consolidated T. Rowe Price investment products [Member] | Reportable entities [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	80.9		70.1
Investments	2,129.9		1,584.0
Other assets	36.6		26.3
Total assets	2,247.4		1,680.4
Liabilities	80.4		38.7
Net assets	2,167.0		1,641.7
Consolidated T. Rowe Price investment products [Member] | Reportable entities [Member] | T. Rowe Price investment products [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Investments	38.2		43.8
Voting interest entities [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Net assets	253.1		271.8
Attributable to T. Rowe Price Group	178.3		175.3
Attributable to redeemable non-controlling interests	74.8		96.5
Voting interest entities [Member] | Reportable entities [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	11.5		18.5
Investments	246.1		261.3
Other assets	6.1		8.0
Total assets	263.7		287.8
Liabilities	10.6		16.0
Net assets	253.1		271.8
Variable interest entities [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Net assets	1,913.9		1,369.9
Attributable to T. Rowe Price Group	885.8		726.1
Attributable to redeemable non-controlling interests	1,028.1		643.8
Variable interest entities [Member] | Reportable entities [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	69.4		51.6
Investments	1,883.8		1,322.7
Other assets	30.5		18.3
Total assets	1,983.7		1,392.6
Liabilities	69.8		22.7
Net assets	1,913.9		1,369.9
Money Market Funds [Member] | Consolidated T. Rowe Price investment products [Member] | Reportable entities [Member] | T. Rowe Price investment products [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	$ 10.2		$ 18.5

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