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Consolidated Investment Products - Schedule of Changes in Level 3 Assets of CIPs (Details) - CIPs [Member] - Level 3 [Member] - USD ($)
$ in Millions
3 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Schedule Of Consolidated Investment Products [Line Items]    
Balance at beginning of period - assets   $ 584.9
Gains included in investment and other income (losses) of consolidated investment products, net   (38.1)
Purchases   3.8
Sales   (0.2)
Transfers Into Level 3   1.7
Balance at End of Period - assets   552.1
Change in unrealized gains included in net income relating to assets held at December 31, 2024   (37.8)
Equity and debt securities [Member]    
Schedule Of Consolidated Investment Products [Line Items]    
Balance at beginning of period - assets $ 550.1 584.9
Gains included in investment and other income (losses) of consolidated investment products, net 22.0 (38.1)
Purchases 9.2 3.8
Sales (11.6) (0.2)
Net consolidations/ (deconsolidations) 3.8  
Transfers Into Level 3   1.1
Balance at End of Period - assets 573.5 551.5
Change in unrealized gains included in net income relating to assets held at December 31, 2024 $ 22.3 (37.8)
Loans [Member]    
Schedule Of Consolidated Investment Products [Line Items]    
Balance at beginning of period - assets   0.0
Gains included in investment and other income (losses) of consolidated investment products, net   0.0
Purchases   0.0
Sales   0.0
Transfers Into Level 3   0.6
Balance at End of Period - assets   0.6
Change in unrealized gains included in net income relating to assets held at December 31, 2024   $ 0.0