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INVESTMENTS - Investments (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Schedule of Equity Method Investments [Line Items]          
U.S. Treasury note $ 1.0   $ 1.0   $ 1.0
Total 3,473.9   3,473.9   3,250.8
Net unrealized gains (losses) on T. Rowe Price investments product recognized in nonoperating income 49.5 $ 125.5 88.3 $ 21.9  
Gains recognized upon deconsolidation 143.9 415.1 246.0 (85.2)  
Variable interest entity, not primary beneficiary          
Schedule of Equity Method Investments [Line Items]          
Unfunded capital commitments 9.9   9.9   12.3
Reclassification out of accumulated other comprehensive income | Currency translation adjustments          
Schedule of Equity Method Investments [Line Items]          
Gains recognized upon deconsolidation 0.0 0.0 2.6 0.1  
Assets          
Schedule of Equity Method Investments [Line Items]          
Net increase (decrease) in assets, liabilities, and redeemable noncontrolling interest (389.2) (100.0) (1,317.3) (146.2)  
Liability          
Schedule of Equity Method Investments [Line Items]          
Net increase (decrease) in assets, liabilities, and redeemable noncontrolling interest (8.9) (1.2) (24.2) (3.6)  
Redeemable noncontrolling interest          
Schedule of Equity Method Investments [Line Items]          
Net increase (decrease) in assets, liabilities, and redeemable noncontrolling interest (274.7) $ (42.8) (1,014.6) $ (62.9)  
Discretionary investments          
Schedule of Equity Method Investments [Line Items]          
Investments held at fair value 1,642.0   1,642.0   1,647.7
Equity method investments 256.4   256.4   242.9
Seed capital          
Schedule of Equity Method Investments [Line Items]          
Investments held at fair value 252.0   252.0   169.5
Equity method investments 257.6   257.6   178.6
Supplemental savings plan liability economic hedges          
Schedule of Equity Method Investments [Line Items]          
Investments held at fair value 802.8   802.8   768.1
Investment partnerships and other investments          
Schedule of Equity Method Investments [Line Items]          
Investments held at fair value 105.4   105.4   95.1
23% investment in UTI Asset Management Company Limited (India)          
Schedule of Equity Method Investments [Line Items]          
Equity method investments $ 154.0   $ 154.0   $ 145.5
Equity method investment (ownership percentage) 23.00%   23.00%   23.00%
Investment partnerships and other investments          
Schedule of Equity Method Investments [Line Items]          
Equity method investments $ 2.7   $ 2.7   $ 2.4