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Investments - Other Investments (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Summarized financial information of unconsolidated entities        
Total assets $ 313,663.6 $ 305,046.7    
Total liabilities 302,194.6 293,836.1    
Total stockholders' equity 11,131.3 10,961.7 $ 10,017.8 $ 12,140.5
Total revenues 16,127.7 13,665.8 17,536.1  
Net income (loss) 1,597.9 670.1 4,797.5  
Other Types of Investments        
Cash surrender value of company owned life insurance 1,273.5 1,186.3    
Certain sponsored investment funds carried at fair value 667.7 576.9    
Equity Method Investment, Nonconsolidated Investee or Group of Investees        
Summarized financial information of unconsolidated entities        
Total assets 222,907.6 215,978.7    
Total liabilities 87,104.7 100,865.3    
Total stockholders' equity 135,802.9 115,113.4    
Total revenues 22,609.3 12,449.3 44,974.8  
Net income (loss) 9,765.6 (2,674.2) 34,322.7  
Our share of net income of unconsolidated entities 305.1 314.9 $ 302.2  
Net Investment in unconsolidated entities        
Summarized financial information of unconsolidated entities        
Net investment in unconsolidated entities $ 3,965.7 $ 3,488.7