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CONSOLIDATED T. ROWE PRICE INVESTMENT PRODUCTS. (Statement of Cash Flows) (Details) - USD ($) $ in Millions		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	[1]	$ 1,486.4	$ 352.8
Net cash provided by (used in) investing activities	[1]	(830.4)	75.4
Net cash provided by (used in) financing activities	[1]	(463.1)	270.6
Effect of exchange rate changes on cash and cash equivalents of consolidated T. Rowe Price investment products	[1]	(2.4)	6.9
Net change in cash and cash equivalents during period	[1]	190.5	705.7
Cash and cash equivalents at beginning of year		1,902.7
Cash and cash equivalents at end of period		2,090.6
Consolidation eliminations [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by (used in) operating activities		(4.1)	(3.5)
Net cash provided by (used in) investing activities		115.8	184.6
Net cash provided by (used in) financing activities		(111.7)	(181.1)
Effect of exchange rate changes on cash and cash equivalents of consolidated T. Rowe Price investment products		0.0	0.0
Net change in cash and cash equivalents during period		0.0	0.0
Consolidated T. Rowe Price investment products [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Cash and cash equivalents at beginning of year		103.1	65.6
Cash and cash equivalents at end of period		105.7	106.8
Consolidated T. Rowe Price investment products [Member] | Reportable entities [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by (used in) operating activities		(570.4)	(1,106.1)
Net cash provided by (used in) investing activities		(22.5)	(46.0)
Net cash provided by (used in) financing activities		597.9	1,186.4
Effect of exchange rate changes on cash and cash equivalents of consolidated T. Rowe Price investment products		(2.4)	6.9
Net change in cash and cash equivalents during period		2.6	41.2
Cash and cash equivalents at beginning of year		103.1	65.6
Cash and cash equivalents at end of period		105.7	106.8
Voting interest entities [Member] | Reportable entities [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by (used in) operating activities		(40.7)	(28.0)
Net cash provided by (used in) investing activities		(0.8)	(6.1)
Net cash provided by (used in) financing activities		52.3	33.3
Effect of exchange rate changes on cash and cash equivalents of consolidated T. Rowe Price investment products		0.0	0.0
Net change in cash and cash equivalents during period		10.8	(0.8)
Cash and cash equivalents at beginning of year		7.1	10.3
Cash and cash equivalents at end of period		17.9	9.5
Variable interest entities [Member] | Reportable entities [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by (used in) operating activities		(529.7)	(1,078.1)
Net cash provided by (used in) investing activities		(21.7)	(39.9)
Net cash provided by (used in) financing activities		545.6	1,153.1
Effect of exchange rate changes on cash and cash equivalents of consolidated T. Rowe Price investment products		(2.4)	6.9
Net change in cash and cash equivalents during period		(8.2)	42.0
Cash and cash equivalents at beginning of year		96.0	55.3
Cash and cash equivalents at end of period		$ 87.8	$ 97.3
[1] See note 12 for supplementary consolidating cash flow statements.

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