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CONSOLIDATED T. ROWE PRICE INVESTMENT PRODUCTS. (Statement of Cash Flows) (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	[1]	$ 521.0	$ 188.5
Net cash provided by (used in) investing activities	[1]	(519.8)	29.4
Net cash provided by (used in) financing activities	[1]	(242.1)	146.0
Effect of exchange rate changes on cash and cash equivalents of consolidated T. Rowe Price investment products	[1]	1.3	(3.4)
Net change in cash and cash equivalents during period	[1]	(239.6)	360.5
Cash and cash equivalents at beginning of year		1,902.7
Cash and cash equivalents at end of period		1,681.4
Consolidation eliminations [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by (used in) operating activities		(0.9)	(0.8)
Net cash provided by (used in) investing activities		26.0	23.0
Net cash provided by (used in) financing activities		(25.1)	(22.2)
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 end of period		84.8	50.2
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		(201.0)	(538.8)
Net cash provided by (used in) investing activities		(21.5)	(46.5)
Net cash provided by (used in) financing activities		202.9	573.3
Effect of exchange rate changes on cash and cash equivalents of consolidated T. Rowe Price investment products		1.3	(3.4)
Net change in cash and cash equivalents during period		(18.3)	(15.4)
Cash and cash equivalents at beginning of year		103.1	65.6
Cash and cash equivalents at end of period		84.8	50.2
Voting interest entities [Member] | Reportable entities [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by (used in) operating activities		(52.8)	(0.6)
Net cash provided by (used in) investing activities		0.0	(6.2)
Net cash provided by (used in) financing activities		63.4	3.2
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		10.6	(3.6)
Cash and cash equivalents at beginning of year		7.1	10.3
Cash and cash equivalents at end of period		17.7	6.7
Variable interest entities [Member] | Reportable entities [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by (used in) operating activities		(148.2)	(538.2)
Net cash provided by (used in) investing activities		(21.5)	(40.3)
Net cash provided by (used in) financing activities		139.5	570.1
Effect of exchange rate changes on cash and cash equivalents of consolidated T. Rowe Price investment products		1.3	(3.4)
Net change in cash and cash equivalents during period		(28.9)	(11.8)
Cash and cash equivalents at beginning of year		96.0	55.3
Cash and cash equivalents at end of period		$ 67.1	$ 43.5
[1] See note 12 for a supplementary consolidating cash flow schedule.

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