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Investments - Principal Investments (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Segment Reporting Information [Line Items]      
Total $ 3,292.3 $ 3,024.1  
Statement of operations information      
Investment income 2,254.4 44.8 $ 1,898.0
Expenses 4,056.1 3,571.7 2,824.7
Net income (loss) 1,091.1 (496.7) 1,284.7
Balance sheet information      
Investments 10,936.7 9,955.3  
Total assets 23,103.5 21,176.0 21,403.0
Other liabilities 241.9 275.9  
Total liabilities 16,755.9 15,391.5  
Total investments in NGP      
Segment Reporting Information [Line Items]      
Total 912.0 916.2  
Equity Method Investment, Nonconsolidated Investee or Group of Investees      
Statement of operations information      
Investment income 5,901.3 6,225.0 5,048.2
Expenses 5,880.3 4,578.4 3,882.6
Net investment income (loss) 21.0 1,646.6 1,165.6
Net realized and unrealized gain (loss) 13,378.9 7,364.1 13,517.9
Net income (loss) 13,399.9 9,010.7 14,683.5
Balance sheet information      
Investments 218,966.0 169,521.2  
Total assets 224,905.7 179,076.1  
Debt 21,115.6 17,261.6  
Other liabilities 6,130.1 4,256.7  
Total liabilities 27,245.8 21,518.3  
Partners’ capital 197,659.9 157,557.8  
Global Private Equity      
Segment Reporting Information [Line Items]      
Total 1,818.0 1,798.3  
Global Private Equity | Total investments in NGP      
Segment Reporting Information [Line Items]      
Total 912.0 916.2  
Global Private Equity | Equity Method Investment, Nonconsolidated Investee or Group of Investees      
Statement of operations information      
Investment income 1,986.9 2,652.7 3,129.1
Expenses 2,644.6 2,320.4 2,151.6
Net investment income (loss) (657.7) 332.3 977.5
Net realized and unrealized gain (loss) 7,911.2 2,980.0 10,643.7
Net income (loss) 7,253.4 3,312.3 11,621.2
Balance sheet information      
Investments 123,663.3 102,536.5  
Total assets 127,257.1 106,116.6  
Debt 11,560.9 8,355.4  
Other liabilities 1,399.3 1,329.3  
Total liabilities 12,960.2 9,684.7  
Partners’ capital 114,296.9 96,431.9  
Global Credit      
Segment Reporting Information [Line Items]      
Total 1,157.0 987.4  
Global Credit | Fortitude Holdings      
Segment Reporting Information [Line Items]      
Total 723.5 595.4  
Global Credit | Equity Method Investment, Nonconsolidated Investee or Group of Investees      
Statement of operations information      
Investment income 3,639.1 3,497.5 1,803.9
Expenses 1,111.8 1,019.5 591.8
Net investment income (loss) 2,527.3 2,478.0 1,212.1
Net realized and unrealized gain (loss) 575.8 224.7 (1.9)
Net income (loss) 3,103.1 2,702.7 1,210.2
Balance sheet information      
Investments 32,367.7 26,814.0  
Total assets 33,970.1 32,803.3  
Debt 6,625.5 6,601.0  
Other liabilities 682.0 777.7  
Total liabilities 7,307.5 7,378.7  
Partners’ capital 26,662.6 25,424.6  
Global Investment Solutions      
Segment Reporting Information [Line Items]      
Total 317.3 238.4  
Global Investment Solutions | Equity Method Investment, Nonconsolidated Investee or Group of Investees      
Statement of operations information      
Investment income 275.3 74.8 115.2
Expenses 2,123.9 1,238.5 1,139.2
Net investment income (loss) (1,848.6) (1,163.7) (1,024.0)
Net realized and unrealized gain (loss) 4,891.9 4,159.4 2,876.1
Net income (loss) 3,043.3 2,995.7 $ 1,852.1
Balance sheet information      
Investments 62,935.0 40,170.7  
Total assets 63,678.5 40,156.2  
Debt 2,929.2 2,305.2  
Other liabilities 4,048.8 2,149.7  
Total liabilities 6,978.1 4,454.9  
Partners’ capital $ 56,700.4 $ 35,701.3