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Variable Interest Entities - Consolidated VIEs (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Jun. 30, 2025 | Dec. 31, 2024 | Sep. 30, 2024 | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | --- | --- | --- | --- | ---
Carrying amounts of consolidated VIE assets and liabilities |  |  |  |  |  |
Total assets | $ 334,491.8 |  | $ 313,663.6 |  |  |
Total liabilities | 322,363.8 |  | 302,194.6 |  |  |
Redeemable noncontrolling interest | 410.1 | $ 391.2 | 337.7 | $ 311.8 | $ 277.4 | $ 248.9
Aggregate consolidated variable interest entities |  |  |  |  |  |
Carrying amounts of consolidated VIE assets and liabilities |  |  |  |  |  |
Total assets | 41,361.6 |  | 35,834.9 |  |  |
Total liabilities | 38,378.1 |  | 33,051.8 |  |  |
Redeemable noncontrolling interest | 381.3 |  | 309.9 |  |  |
Mandatory retirement savings funds |  |  |  |  |  |
Carrying amounts of consolidated VIE assets and liabilities |  |  |  |  |  |
Total assets | 38,683.4 |  | 33,130.4 |  |  |
Total liabilities | 38,300.6 |  | 32,802.2 |  |  |
Real estate VIE |  |  |  |  |  |
Carrying amounts of consolidated VIE assets and liabilities |  |  |  |  |  |
Total assets | 865.6 |  | 814.3 |  |  |
Total liabilities | 36.4 |  | 69.4 |  |  |
Sponsored investment funds |  |  |  |  |  |
Carrying amounts of consolidated VIE assets and liabilities |  |  |  |  |  |
Total assets | 809.7 |  | 833.7 |  |  |
Total liabilities | 22.2 |  | 160.3 |  |  |
Redeemable noncontrolling interest | 381.3 |  | 309.9 |  |  |
Residential mortgage loans VIE |  |  |  |  |  |
Carrying amounts of consolidated VIE assets and liabilities |  |  |  |  |  |
Total assets | 748.5 |  | 806.5 |  |  |
Total liabilities | 18.9 |  | 19.9 |  |  |
Asset-backed limited partnership |  |  |  |  |  |
Carrying amounts of consolidated VIE assets and liabilities |  |  |  |  |  |
Total assets | $ 254.4 |  | $ 250.0 |  |  |

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