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CONSOLIDATED T. ROWE PRICE INVESTMENT PRODUCTS. (Net Assets) (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Dec. 31, 2016
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	$ 2,090.6	$ 1,902.7
Investments	2,414.4	1,477.3
Other assets	202.0	224.0
Total assets	8,530.6	7,535.4
Liabilities	1,209.5	718.2
Attributable to redeemable non-controlling interests	860.6	992.8
Consolidated T. Rowe Price investment products [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	105.7	103.1	$ 106.8	$ 65.6
Net assets	1,843.1	1,992.5
Attributable to T. Rowe Price Group	982.5	999.7
Attributable to redeemable non-controlling interests	860.6	992.8
Consolidated T. Rowe Price investment products [Member] | Reportable entities [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	105.7	103.1	106.8	65.6
Investments	1,781.5	1,914.5
Other assets	30.6	30.8
Total assets	1,917.8	2,048.4
Liabilities	74.7	55.9
Net assets	1,843.1	1,992.5
Consolidated T. Rowe Price investment products [Member] | Reportable entities [Member] | T. Rowe Price money market mutual funds [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	17.6	6.2
Investments	46.8	15.0
Voting interest entities [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Net assets	290.3	192.4
Attributable to T. Rowe Price Group	190.9	131.6
Attributable to redeemable non-controlling interests	99.4	60.8
Voting interest entities [Member] | Reportable entities [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	17.9	7.1	9.5	10.3
Investments	277.4	188.8
Other assets	8.7	12.9
Total assets	304.0	208.8
Liabilities	13.7	16.4
Net assets	290.3	192.4
Variable interest entities [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Net assets	1,552.8	1,800.1
Attributable to T. Rowe Price Group	791.6	868.1
Attributable to redeemable non-controlling interests	761.2	932.0
Variable interest entities [Member] | Reportable entities [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	87.8	96.0	$ 97.3	$ 55.3
Investments	1,504.1	1,725.7
Other assets	21.9	17.9
Total assets	1,613.8	1,839.6
Liabilities	61.0	39.5
Net assets	$ 1,552.8	$ 1,800.1

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