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Investments - Components of Investment Income (Loss) (Details) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Dec. 31, 2024
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Schedule of Investments [Line Items]        
Unrealized principal investment (income) loss   $ 2,254.4 $ 44.8 $ 1,898.0
Reversed unrealized income   (157.1) (327.7) 378.5
Carlyle Secured Lending, Inc. Merger        
Schedule of Investments [Line Items]        
Reversed unrealized income $ 45.5      
Performance allocations - realized        
Schedule of Investments [Line Items]        
Unrealized principal investment (income) loss   1,047.5 867.0 2,048.8
Performance allocations - unrealized        
Schedule of Investments [Line Items]        
Unrealized principal investment (income) loss   968.2 (955.6) (721.3)
Performance allocations        
Schedule of Investments [Line Items]        
Unrealized principal investment (income) loss   2,015.7 (88.6) 1,327.5
Principal investment income (loss) from equity method investments - realized        
Schedule of Investments [Line Items]        
Unrealized principal investment (income) loss   184.5 231.7 73.1
Principal investment income (loss) from equity method investments - unrealized        
Schedule of Investments [Line Items]        
Unrealized principal investment (income) loss   52.0 (115.1) 546.4
Principal investment income (loss) from equity method investments        
Schedule of Investments [Line Items]        
Unrealized principal investment (income) loss   236.5 116.6 619.5
Principal investment income (loss) from investments in CLOs and other investments - realized        
Schedule of Investments [Line Items]        
Unrealized principal investment (income) loss   3.8 (1.1) 5.0
Principal investment income (loss) from investments in CLOs and other investments- unrealized        
Schedule of Investments [Line Items]        
Unrealized principal investment (income) loss   (1.6) 17.9 (54.0)
Principal investment income (loss) from investments in CLOs and other investments- unrealized | Corporate investment        
Schedule of Investments [Line Items]        
Unrealized principal investment (income) loss   (5.3) (13.3)  
Principal investment income (loss) from investments in CLOs and other investments        
Schedule of Investments [Line Items]        
Unrealized principal investment (income) loss   $ 2.2 $ 16.8 $ (49.0)