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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

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