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CONSOLIDATED SPONSORED INVESTMENT PRODUCTS - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Condensed Income Statements, Captions [Line Items]        
Operating expenses $ 1,089.4 $ 1,013.6 $ 3,219.5 $ 2,843.6
Net cash provided by (used in) financing activities     (617.2) (1,616.7)
Consolidation eliminations        
Condensed Income Statements, Captions [Line Items]        
Operating expenses $ 0.7 $ 0.5 1.6 2.0
Net cash provided by (used in) financing activities     $ (397.7) $ 22.3