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INVESTMENTS. (Investments) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Schedule of Equity Method Investments [Line Items]
U.S. Treasury note	$ 1.0		$ 1.0
Total	3,403.6		3,250.8
Net unrealized gains (losses) on T. Rowe Price investments product recognized in nonoperating income	38.8	$ (103.6)
Gains recognized upon deconsolidation	102.1	(500.3)
Reclassification out of accumulated other comprehensive income | Currency translation adjustments
Schedule of Equity Method Investments [Line Items]
Gains recognized upon deconsolidation	2.6	0.1
Assets
Schedule of Equity Method Investments [Line Items]
Net increase (decrease) in assets, liabilities, and redeemable noncontrolling interest	(928.1)	(46.2)
Liability
Schedule of Equity Method Investments [Line Items]
Net increase (decrease) in assets, liabilities, and redeemable noncontrolling interest	(15.3)	(2.4)
Redeemable noncontrolling interest
Schedule of Equity Method Investments [Line Items]
Net increase (decrease) in assets, liabilities, and redeemable noncontrolling interest	(739.9)	$ (20.1)
Discretionary investments
Schedule of Equity Method Investments [Line Items]
Investments held at fair value	1,664.3		1,647.7
Equity method investments	245.8		242.9
Seed capital
Schedule of Equity Method Investments [Line Items]
Investments held at fair value	269.5		169.5
Equity method investments	203.7		178.6
Supplemental savings plan liability economic hedges
Schedule of Equity Method Investments [Line Items]
Investments held at fair value	766.9		768.1
Investment partnerships and other investments
Schedule of Equity Method Investments [Line Items]
Investments held at fair value	100.6		95.1
23% investment in UTI Asset Management Company Limited (India)
Schedule of Equity Method Investments [Line Items]
Equity method investments	$ 149.1		$ 145.5
Equity method investment (ownership percentage)	23.00%		23.00%
Investment partnerships and other investments
Schedule of Equity Method Investments [Line Items]
Equity method investments	$ 2.7		$ 2.4

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