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Redeemable Noncontrolling Interests (Details) - USD ($)
$ in Millions
 3 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Noncontrolling Interest [Line Items]    
Balance at beginning of period $ 1,321.8  
Net income (loss) 49.6 $ 9.5
Net subscriptions (distributions) and other 13.1 9.6
Net consolidations (deconsolidations) 4.7  
Adjustment to fair value 1.5 (65.9)
Balance at End of Period 2,106.0  
Minority Interests [Member]    
Noncontrolling Interest [Line Items]    
Balance at beginning of period 634.0 446.0
Net income (loss) 10.7 12.4
Net subscriptions (distributions) and other (3.7) (1.1)
Net consolidations (deconsolidations) 0.0 0.0
Adjustment to fair value (1.5) 65.9
Balance at End of Period 639.5 523.2
Redeemable Noncontrolling Interests [Member]    
Noncontrolling Interest [Line Items]    
Balance at beginning of period 1,321.8 1,026.1
Net income (loss) 49.6 9.5
Net subscriptions (distributions) and other 171.9 37.0
Net consolidations (deconsolidations) 564.2 (60.0)
Adjustment to fair value (1.5) 65.9
Balance at End of Period 2,106.0 1,078.5
Retained Earnings [Member]    
Noncontrolling Interest [Line Items]    
Adjustment to fair value 1.5 (65.9)
CIPs [Member]    
Noncontrolling Interest [Line Items]    
Balance at beginning of period 687.8 580.1
Net income (loss) 38.9 (2.9)
Net subscriptions (distributions) and other 175.6 38.1
Net consolidations (deconsolidations) 564.2 (60.0)
Adjustment to fair value 0.0 0.0
Balance at End of Period $ 1,466.5 $ 555.3