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INVESTMENTS. (Investments) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Investment [Line Items]      
Cost method investments     $ 78.0
U.S. Treasury note $ 1.0   1.0
Total 2,095.1   1,477.3
Available-for-sale investments     597.1
Net unrealized losses on T. Rowe Price investments product recognized in nonoperating income (1.9)    
Gains (losses) recognized upon deconsolidation 16.1 $ 115.0  
Reclassification out of accumulated other comprehensive income [Member] | Currency translation adjustments [Member]      
Investment [Line Items]      
Gains (losses) recognized upon deconsolidation 3.1 0.0  
Assets [Member]      
Investment [Line Items]      
Net increase (decrease) in assets, liabilities, and redeemable noncontrolling interest 757.5 1,035.9  
Liability [Member]      
Investment [Line Items]      
Net increase (decrease) in assets, liabilities, and redeemable noncontrolling interest (5.2) (133.2)  
Redeemable noncontrolling interest [Member]      
Investment [Line Items]      
Net increase (decrease) in assets, liabilities, and redeemable noncontrolling interest (632.9) $ (767.7)  
T. Rowe Price investment products [Member]      
Investment [Line Items]      
Investments held at fair value 1,231.1   692.1
Equity method investments 316.7   277.4
T. Rowe Price investment products designated as economic hedge of supplemental savings plan liability [Member]      
Investment [Line Items]      
Investments held at fair value 283.3   268.2
Investment partnerships and other investments [Member]      
Investment [Line Items]      
Investments held at fair value 95.2    
Interest in UTI Asset Management Company Limited (India) [Member]      
Investment [Line Items]      
Equity method investments $ 163.2   $ 155.8
Equity method investment (ownership percentage) 26.00%   26.00%
Investment partnerships and other investments [Member]      
Investment [Line Items]      
Equity method investments $ 4.6   $ 4.8