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INVESTMENTS. (Investments) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Investment [Line Items]
T. Rowe Price investment products held as available-for-sale	$ 597.1	$ 709.0
Cost method investments	78.0	73.6
U.S. Treasury note	1.0	1.0
Total	1,477.3	1,257.5
Gains (losses) recognized upon deconsolidation	396.3	227.1	$ 103.5
T. Rowe Price investment products [Member]
Investment [Line Items]
Equity method investments	277.4	252.3
Trading investments	95.0	75.4
T. Rowe Price investment products designated as an economic hedge of supplemental savings plan liability [Member]
Investment [Line Items]
Trading investments	268.2	0.0
Interest in UTI Asset Management Company Limited (India) [Member]
Investment [Line Items]
Equity method investments	$ 155.8	$ 140.9
Equity method investment (ownership percentage)	26.00%	26.00%
Investment partnerships [Member]
Investment [Line Items]
Equity method investments	$ 4.8	$ 5.3
Currency translation adjustments [Member] | Reclassification out of accumulated other comprehensive income [Member]
Investment [Line Items]
Gains (losses) recognized upon deconsolidation	0.1	2.2	(5.8)
Assets [Member]
Investment [Line Items]
Net increase (decrease) in assets, liabilities, and redeemable noncontrolling interest	1,397.2	1,342.8	20.3
Liability [Member]
Investment [Line Items]
Net increase (decrease) in assets, liabilities, and redeemable noncontrolling interest	(153.1)	(37.3)	0.0
Redeemable non-controlling interest [Member]
Investment [Line Items]
Net increase (decrease) in assets, liabilities, and redeemable noncontrolling interest	$ (1,042.6)	$ (967.3)	$ 0.0

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