v3.24.1.u1
Consolidated Investment Products - Schedule of Changes in Level 3 Assets of CIPs (Details) - CIPs [Member] - Level 3 [Member] - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2024
Mar. 31, 2023
Schedule Of Consolidated Investment Products [Line Items]        
Balance at beginning of period - assets $ 551.5 $ 978.5 $ 584.9 $ 1,063.8
Losses included in investment and other income of consolidated investment products, net (0.1) (31.1) (38.2) (33.6)
Purchases 22.8 45.0 26.6 167.2
Sales (0.3) (19.4) (0.5) (25.2)
Net consolidations/ (deconsolidations) (12.5) (428.7) (12.5) (627.9)
Transfers Into Level 3   3.1 (1.1) 3.1
Balance at End of Period - assets 591.0 542.1 591.0 542.1
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Acquisition 29.6   29.6  
Change in unrealized losses included in net income relating to assets held at March 31, 2024 0.0 (25.0) (37.6) (22.3)
Transfers out of Level 3 - assets   (5.3)   (5.3)
Equity and debt securities [Member]        
Schedule Of Consolidated Investment Products [Line Items]        
Balance at beginning of period - assets 551.5 555.8 584.9 555.8
Losses included in investment and other income of consolidated investment products, net (0.1) (18.4) (38.2) (24.7)
Purchases 22.8 13.5 26.6 22.5
Sales (0.3) (19.4) (0.5) (25.0)
Net consolidations/ (deconsolidations) (12.5) 7.5 (12.5) 10.4
Transfers Into Level 3   0.0 (1.1) 0.0
Balance at End of Period - assets 591.0 539.0 591.0 539.0
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Acquisition 29.6   29.6  
Change in unrealized losses included in net income relating to assets held at March 31, 2024 $ 0.0 (25.0) $ (37.6) (22.3)
Transfers out of Level 3 - assets   0.0   0.0
Real Estate [Member]        
Schedule Of Consolidated Investment Products [Line Items]        
Balance at beginning of period - assets   358.0   268.6
Losses included in investment and other income of consolidated investment products, net   (12.7)   (9.0)
Purchases   0.4   86.1
Sales   0.0   0.0
Net consolidations/ (deconsolidations)   (345.7)   (345.7)
Transfers Into Level 3   0.0   0.0
Balance at End of Period - assets   0.0   0.0
Change in unrealized losses included in net income relating to assets held at March 31, 2024   0.0   0.0
Transfers out of Level 3 - assets   0.0   0.0
Loans [Member]        
Schedule Of Consolidated Investment Products [Line Items]        
Balance at beginning of period - assets   64.7   239.4
Losses included in investment and other income of consolidated investment products, net   0.0   0.1
Purchases   31.1   58.6
Sales   0.0   (0.2)
Net consolidations/ (deconsolidations)   (90.5)   (292.6)
Transfers Into Level 3   3.1   3.1
Balance at End of Period - assets   3.1   3.1
Change in unrealized losses included in net income relating to assets held at March 31, 2024   0.0   0.0
Transfers out of Level 3 - assets   $ (5.3)   $ (5.3)