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OTHER COMPREHENSIVE INCOME AND ACCUMULATED OTHER COMPREHENSIVE LOSS - Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balances at beginning of period $ 10,555.1 $ 9,989.5 $ 10,506.1 $ 9,697.1
Other comprehensive income (loss) before income taxes 17.5 1.2 20.9 (3.3)
Net deferred tax benefits (income taxes) (2.3) (0.4) (2.8) 0.4
Total other comprehensive income (loss) 15.2 0.8 18.1 (2.9)
Balances at end of period 10,713.8 10,134.0 10,713.8 10,134.0
Currency translation adjustments        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balances at beginning of period (51.9) (49.6) (51.7) (47.5)
Other comprehensive income (loss) before reclassifications and income taxes 12.7 0.8 13.0 (2.1)
Reclassification adjustments recognized in non-operating income (3.1) 0.0 (3.1) 0.0
Other comprehensive income (loss) before income taxes 9.6 0.8 9.9 (2.1)
Net deferred tax benefits (income taxes) (2.3) (0.4) (2.8) 0.4
Total other comprehensive income (loss) 7.3 0.4 7.1 (1.7)
Balances at end of period (44.6) (49.2) (44.6) (49.2)
Currency translation adjustments | Equity method investments        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balances at beginning of period (53.2) (50.9) (49.5) (51.9)
Other comprehensive income (loss) before reclassifications and income taxes 0.8 (0.6) (3.5) 0.5
Reclassification adjustments recognized in non-operating income 0.0 0.0 0.0 0.0
Other comprehensive income (loss) before income taxes 0.8 (0.6) (3.5) 0.5
Net deferred tax benefits (income taxes) (0.1) 0.0 0.5 (0.1)
Total other comprehensive income (loss) 0.7 (0.6) (3.0) 0.4
Balances at end of period (52.5) (51.5) (52.5) (51.5)
Currency translation adjustments | Consolidated investment products - variable interest entities        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balances at beginning of period 1.3 1.3 (2.2) 4.4
Other comprehensive income (loss) before reclassifications and income taxes 11.9 1.4 16.5 (2.6)
Reclassification adjustments recognized in non-operating income (3.1) 0.0 (3.1) 0.0
Other comprehensive income (loss) before income taxes 8.8 1.4 13.4 (2.6)
Net deferred tax benefits (income taxes) (2.2) (0.4) (3.3) 0.5
Total other comprehensive income (loss) 6.6 1.0 10.1 (2.1)
Balances at end of period $ 7.9 $ 2.3 $ 7.9 $ 2.3