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INVESTMENTS. (Investments) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Schedule of Equity Method Investments [Line Items]      
U.S. Treasury note $ 1.0   $ 1.0
Total 2,731.3   2,939.8
Net unrealized gains (losses) on T. Rowe Price investments product recognized in nonoperating income (103.6) $ 50.6  
Gains recognized upon deconsolidation (500.3) 202.8  
Reclassification out of accumulated other comprehensive income | Currency translation adjustments      
Schedule of Equity Method Investments [Line Items]      
Gains recognized upon deconsolidation 0.1 0.1  
Assets      
Schedule of Equity Method Investments [Line Items]      
Net increase (decrease) in assets, liabilities, and redeemable noncontrolling interest (46.2) 12.3  
Liability      
Schedule of Equity Method Investments [Line Items]      
Net increase (decrease) in assets, liabilities, and redeemable noncontrolling interest (2.4) (0.9)  
Redeemable noncontrolling interest      
Schedule of Equity Method Investments [Line Items]      
Net increase (decrease) in assets, liabilities, and redeemable noncontrolling interest (20.1) $ 20.4  
T. Rowe Price investment products      
Schedule of Equity Method Investments [Line Items]      
Investments held at fair value 1,088.1   1,402.9
Equity method investments 864.5   705.6
T. Rowe Price investment products designated as an economic hedge of supplemental savings plan liability      
Schedule of Equity Method Investments [Line Items]      
Investments held at fair value 500.0   561.1
Investment partnerships and other investments      
Schedule of Equity Method Investments [Line Items]      
Investments held at fair value 105.5   99.7
26% interest in UTI Asset Management Company Limited (India)      
Schedule of Equity Method Investments [Line Items]      
Equity method investments $ 166.8   $ 164.5
Equity method investment (ownership percentage) 26.00%   26.00%
Investment partnerships and other investments      
Schedule of Equity Method Investments [Line Items]      
Equity method investments $ 5.4   $ 5.0