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CONSOLIDATED T. ROWE PRICE INVESTMENT PRODUCTS. (Net Assets) (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	$ 1,425.2	$ 1,902.7
Investments	2,453.4	1,477.3
Other assets	253.7	224.0
Total assets	7,689.3	7,535.4
Liabilities	824.7	718.2
Attributable to redeemable non-controlling interests	740.3	992.8	$ 687.2	$ 672.7
Consolidated T. Rowe Price investment products [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	70.1	103.1	$ 65.6
Net assets	1,641.7	1,992.5
Attributable to redeemable non-controlling interests	740.3	992.8
Attributable to T. Rowe Price Group	901.4	999.7
Consolidated T. Rowe Price investment products [Member] | Reportable entities [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	70.1	103.1
Investments	1,584.0	1,914.5
Other assets	26.3	30.8
Total assets	1,680.4	2,048.4
Liabilities	38.7	55.9
Net assets	1,641.7	1,992.5
Consolidated T. Rowe Price investment products [Member] | Reportable entities [Member] | T.Rowe Price U.S. mutual funds [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Investments	43.8	15.0
Consolidated T. Rowe Price investment products [Member] | Reportable entities [Member] | T.Rowe Price U.S. mutual funds [Member] | Money market mutual funds [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	18.5	6.2
Voting interest entities [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Net assets	271.8	192.4
Attributable to redeemable non-controlling interests	96.5	60.8
Attributable to T. Rowe Price Group	175.3	131.6
Voting interest entities [Member] | Reportable entities [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	18.5	7.1
Investments	261.3	188.8
Other assets	8.0	12.9
Total assets	287.8	208.8
Liabilities	16.0	16.4
Net assets	271.8	192.4
Variable interest entities [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Net assets	1,369.9	1,800.1
Attributable to redeemable non-controlling interests	643.8	932.0
Attributable to T. Rowe Price Group	726.1	868.1
Variable interest entities [Member] | Reportable entities [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	51.6	96.0
Investments	1,322.7	1,725.7
Other assets	18.3	17.9
Total assets	1,392.6	1,839.6
Liabilities	22.7	39.5
Net assets	$ 1,369.9	$ 1,800.1

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