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OTHER COMPREHENSIVE INCOME AND ACCUMULATED OTHER COMPREHENSIVE INCOME - Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balances $ 8,839.5    
Other comprehensive income (loss) 5.5 $ (26.5) $ (3.5)
Ending balances 9,505.1 8,839.5  
Currency translation adjustments      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balances (53.0) (26.5) (23.0)
Other comprehensive income (loss) before reclassifications and income taxes 7.4 (28.5) (4.5)
Reclassification adjustments recognized in non-operating income   (3.0) (2.4)
Other comprehensive income (loss), before taxes   (31.5) (6.9)
Net deferred tax benefits (income taxes) (1.9) 5.0 3.4
Other comprehensive income (loss) 5.5 (26.5) (3.5)
Ending balances (47.5) (53.0) (26.5)
Currency translation adjustments | Equity method investments      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balances (50.5) (36.7) (43.6)
Other comprehensive income (loss) before reclassifications and income taxes (1.6) (14.6) 7.0
Reclassification adjustments recognized in non-operating income   0.0 0.0
Other comprehensive income (loss), before taxes   (14.6) 7.0
Net deferred tax benefits (income taxes) 0.2 0.8 (0.1)
Other comprehensive income (loss) (1.4) (13.8) 6.9
Ending balances (51.9) (50.5) (36.7)
Currency translation adjustments | Consolidated sponsored investment products - variable interest entities      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balances (2.5) 10.2 20.6
Other comprehensive income (loss) before reclassifications and income taxes 9.0 (13.9) (11.5)
Reclassification adjustments recognized in non-operating income   (3.0) (2.4)
Other comprehensive income (loss), before taxes   (16.9) (13.9)
Net deferred tax benefits (income taxes) (2.1) 4.2 3.5
Other comprehensive income (loss) 6.9 (12.7) (10.4)
Ending balances 4.4 (2.5) 10.2
Total net deferred tax benefits      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balances (53.0) (26.5) (23.0)
Other comprehensive income (loss) before reclassifications and income taxes 7.4 (28.5) (4.5)
Reclassification adjustments recognized in non-operating income   (3.0) (2.4)
Other comprehensive income (loss), before taxes   (31.5) (6.9)
Net deferred tax benefits (income taxes) (1.9) 5.0 3.4
Other comprehensive income (loss) [1] 5.5 (26.5) (3.5)
Ending balances $ (47.5) $ (53.0) $ (26.5)
[1] Accumulated other comprehensive income