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OTHER COMPREHENSIVE INCOME AND ACCUMULATED OTHER COMPREHENSIVE LOSS - Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balances at beginning of period $ 10,506.1 $ 9,697.1
Net deferred tax benefits (income taxes) (0.5) 0.8
Total other comprehensive income (loss) 2.9 (3.7)
Balances at end of period 10,555.1 9,989.5
Currency translation adjustments    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balances at beginning of period (51.7) (47.5)
Other comprehensive income (loss) before reclassifications and income taxes 0.3 (2.9)
Net deferred tax benefits (income taxes) (0.5) 0.8
Total other comprehensive income (loss) (0.2) (2.1)
Balances at end of period (51.9) (49.6)
Currency translation adjustments | Equity method investments    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balances at beginning of period (49.5) (51.9)
Other comprehensive income (loss) before reclassifications and income taxes (4.3) 1.1
Net deferred tax benefits (income taxes) 0.6 (0.1)
Total other comprehensive income (loss) (3.7) 1.0
Balances at end of period (53.2) (50.9)
Currency translation adjustments | Consolidated investment products - variable interest entities    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balances at beginning of period (2.2) 4.4
Other comprehensive income (loss) before reclassifications and income taxes 4.6 (4.0)
Net deferred tax benefits (income taxes) (1.1) 0.9
Total other comprehensive income (loss) 3.5 (3.1)
Balances at end of period $ 1.3 $ 1.3