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Investments - Other Investments (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Summarized financial information of unconsolidated entities |  |  |  |
Total assets | $ 305,046.7 | $ 290,867.0 |  |
Total liabilities | 293,836.1 | 280,587.2 |  |
Total stockholders' equity | 10,961.7 | 10,017.8 | $ 12,140.5 | $ 16,617.3
Total revenues | 13,665.8 | 17,536.1 | 14,427.8 |
Net income (loss) | 670.1 | 4,797.5 | 1,627.0 |
Other Types of Investments |  |  |  |
Cash surrender value of company owned life insurance | 1,186.3 | 1,115.6 |  |
Certain sponsored investment funds carried at fair value | 576.9 | 617.8 |  |
Equity Method Investment, Nonconsolidated Investee or Group of Investees |  |  |  |
Summarized financial information of unconsolidated entities |  |  |  |
Total assets | 215,978.7 | 209,546.0 |  |
Total liabilities | 100,865.3 | 81,160.9 |  |
Total stockholders' equity | 115,113.4 | 128,385.1 |  |
Total revenues | 12,449.3 | 44,974.8 | 21,751.9 |
Net income (loss) | (2,674.2) | 34,322.7 | 15,732.5 |
Our share of net income of unconsolidated entities | 314.9 | 302.2 | $ 406.6 |
Net Investment in unconsolidated entities |  |  |  |
Summarized financial information of unconsolidated entities |  |  |  |
Net investment in unconsolidated entities | $ 3,488.7 | $ 2,767.9 |  |

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