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INVESTMENTS. (Investments) (Details) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Oct. 31, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Debt and Equity Securities, FV-NI [Line Items]
U.S. Treasury note		$ 1.0	$ 1.0
Total		3,250.8	2,939.8
Net unrealized gains (losses) on T. Rowe Price investments product recognized in nonoperating income		142.7	105.4	$ (18.5)
Gains recognized upon deconsolidation		496.5	540.3	23.2
Currency translation adjustments | Reclassification out of accumulated other comprehensive income
Debt and Equity Securities, FV-NI [Line Items]
Gains recognized upon deconsolidation		0.7	0.1	3.6
Assets
Debt and Equity Securities, FV-NI [Line Items]
Net increase (decrease) in assets, liabilities, and redeemable noncontrolling interest		(546.1)	(380.5)	(736.6)
Liability
Debt and Equity Securities, FV-NI [Line Items]
Net increase (decrease) in assets, liabilities, and redeemable noncontrolling interest		(10.5)	(15.0)	17.6
Redeemable non-controlling interest
Debt and Equity Securities, FV-NI [Line Items]
Net increase (decrease) in assets, liabilities, and redeemable noncontrolling interest		(308.1)	(267.6)	(626.4)
Discretionary investments
Debt and Equity Securities, FV-NI [Line Items]
Investments held at fair value		1,647.7	1,221.8
Equity method investments		242.9	610.0
Seed capital
Debt and Equity Securities, FV-NI [Line Items]
Investments held at fair value		169.5	181.1
Equity method investments		178.6	95.6
Dividend distribution		50.8	50.6	$ 36.0
Supplemental savings plan liability economic hedges
Debt and Equity Securities, FV-NI [Line Items]
Investments held at fair value		768.1	561.1
Investment partnerships and other investments
Debt and Equity Securities, FV-NI [Line Items]
Investments held at fair value		95.1	99.7
Investment in UTI Asset Management Company Limited (India)
Debt and Equity Securities, FV-NI [Line Items]
Equity method investments		$ 145.5	164.5
Equity method investment (ownership percentage)	23.00%	26.00%
Gain on sale of equity investments	$ 2.8
Investment partnerships and other investments
Debt and Equity Securities, FV-NI [Line Items]
Equity method investments		$ 2.4	$ 5.0

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