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Fair Value Measurement - Changes in Level III Financial Assets Measured at Fair Value (Details)
$ in Millions
3 Months Ended
Mar. 31, 2025
USD ($)
fund
Mar. 31, 2024
USD ($)
Realized and unrealized gains (losses), net    
Number of deconsolidated funds | fund 1  
Equity securities    
Realized and unrealized gains (losses), net    
Fair value, asset, recurring basis, unobservable input reconciliation, gain (loss), statement of income or comprehensive income Net investment income (loss) of Consolidated Funds Net investment income (loss) of Consolidated Funds
Fair value, asset, recurring basis, unobservable input reconciliation, asset, gain (loss), statement of other comprehensive income or comprehensive income Other Comprehensive Income (Loss), Net of Tax Other Comprehensive Income (Loss), Net of Tax
Fair value, asset, recurring basis, still held, unrealized gain (loss), statement of income or comprehensive income Net investment income (loss) of Consolidated Funds Net investment income (loss) of Consolidated Funds
Bonds    
Realized and unrealized gains (losses), net    
Fair value, asset, recurring basis, unobservable input reconciliation, gain (loss), statement of income or comprehensive income Net investment income (loss) of Consolidated Funds Net investment income (loss) of Consolidated Funds
Fair value, asset, recurring basis, unobservable input reconciliation, asset, gain (loss), statement of other comprehensive income or comprehensive income Other Comprehensive Income (Loss), Net of Tax Other Comprehensive Income (Loss), Net of Tax
Fair value, asset, recurring basis, still held, unrealized gain (loss), statement of income or comprehensive income Net investment income (loss) of Consolidated Funds Net investment income (loss) of Consolidated Funds
Loans    
Realized and unrealized gains (losses), net    
Fair value, asset, recurring basis, unobservable input reconciliation, gain (loss), statement of income or comprehensive income Net investment income (loss) of Consolidated Funds Net investment income (loss) of Consolidated Funds
Fair value, asset, recurring basis, unobservable input reconciliation, asset, gain (loss), statement of other comprehensive income or comprehensive income Other Comprehensive Income (Loss), Net of Tax Other Comprehensive Income (Loss), Net of Tax
Fair value, asset, recurring basis, still held, unrealized gain (loss), statement of income or comprehensive income Net investment income (loss) of Consolidated Funds Net investment income (loss) of Consolidated Funds
Investments in CLOs    
Realized and unrealized gains (losses), net    
Fair value, asset, recurring basis, unobservable input reconciliation, gain (loss), statement of income or comprehensive income Net investment income (loss) of Consolidated Funds Net investment income (loss) of Consolidated Funds
Fair value, asset, recurring basis, unobservable input reconciliation, asset, gain (loss), statement of other comprehensive income or comprehensive income Other Comprehensive Income (Loss), Net of Tax Other Comprehensive Income (Loss), Net of Tax
Fair value, asset, recurring basis, still held, unrealized gain (loss), statement of income or comprehensive income Net investment income (loss) of Consolidated Funds Net investment income (loss) of Consolidated Funds
Other investments    
Realized and unrealized gains (losses), net    
Fair value, asset, recurring basis, unobservable input reconciliation, gain (loss), statement of income or comprehensive income Net investment income (loss) of Consolidated Funds Net investment income (loss) of Consolidated Funds
Fair value, asset, recurring basis, unobservable input reconciliation, asset, gain (loss), statement of other comprehensive income or comprehensive income Other Comprehensive Income (Loss), Net of Tax Other Comprehensive Income (Loss), Net of Tax
Fair value, asset, recurring basis, still held, unrealized gain (loss), statement of income or comprehensive income Net investment income (loss) of Consolidated Funds Net investment income (loss) of Consolidated Funds
Level III    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance, beginning of period $ 7,932.5 $ 7,379.4
Initial consolidation of funds 192.9  
Transfer out related to the Exchange (50.4)  
Purchases 2,573.8 1,469.6
Sales and distributions (1,072.9) (833.3)
Settlements (358.9) (464.7)
Realized and unrealized gains (losses), net    
Included in earnings 13.5 104.1
Included in other comprehensive income 148.8 (88.5)
Balance, end of period 9,379.3 7,566.6
Changes in unrealized gains (losses) included in earnings related to financial assets still held at the reporting date 24.9 92.0
Changes in unrealized gains (losses) included in other comprehensive income related to financial assets still held at the reporting date 134.6 (83.1)
Level III | Equity securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance, beginning of period 572.0 377.6
Initial consolidation of funds 0.0  
Transfer out related to the Exchange 0.0  
Purchases 253.2 24.8
Sales and distributions (9.0) (6.1)
Settlements 0.0 0.0
Realized and unrealized gains (losses), net    
Included in earnings 5.5 (9.0)
Included in other comprehensive income 0.0 0.0
Balance, end of period 821.7 387.3
Changes in unrealized gains (losses) included in earnings related to financial assets still held at the reporting date 4.8 (9.0)
Changes in unrealized gains (losses) included in other comprehensive income related to financial assets still held at the reporting date 0.0 0.0
Level III | Bonds    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance, beginning of period 465.1 522.5
Initial consolidation of funds 24.0  
Transfer out related to the Exchange 0.0  
Purchases 56.4 46.4
Sales and distributions (72.6) (72.8)
Settlements 0.0 0.0
Realized and unrealized gains (losses), net    
Included in earnings 4.5 15.6
Included in other comprehensive income 18.4 (11.3)
Balance, end of period 495.8 500.4
Changes in unrealized gains (losses) included in earnings related to financial assets still held at the reporting date 4.2 16.4
Changes in unrealized gains (losses) included in other comprehensive income related to financial assets still held at the reporting date 15.5 (10.2)
Level III | Loans    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance, beginning of period 6,431.4 5,862.1
Initial consolidation of funds 167.9  
Transfer out related to the Exchange 0.0  
Purchases 2,225.3 1,397.4
Sales and distributions (943.9) (729.5)
Settlements (358.9) (464.7)
Realized and unrealized gains (losses), net    
Included in earnings (10.9) 72.8
Included in other comprehensive income 121.7 (73.2)
Balance, end of period 7,632.6 6,064.9
Changes in unrealized gains (losses) included in earnings related to financial assets still held at the reporting date 0.6 60.8
Changes in unrealized gains (losses) included in other comprehensive income related to financial assets still held at the reporting date 109.4 (68.9)
Level III | Investments in CLOs    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance, beginning of period 378.9 532.6
Initial consolidation of funds 1.0  
Transfer out related to the Exchange 0.0  
Purchases 1.1 1.0
Sales and distributions (36.2) (24.0)
Settlements 0.0 0.0
Realized and unrealized gains (losses), net    
Included in earnings 12.0 15.2
Included in other comprehensive income 8.7 (4.0)
Balance, end of period 365.5 520.8
Changes in unrealized gains (losses) included in earnings related to financial assets still held at the reporting date 10.2 15.2
Changes in unrealized gains (losses) included in other comprehensive income related to financial assets still held at the reporting date 9.7 (4.0)
Level III | Other investments    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance, beginning of period 85.1 84.6
Initial consolidation of funds 0.0  
Transfer out related to the Exchange (50.4)  
Purchases 37.8 0.0
Sales and distributions (11.2) (0.9)
Settlements 0.0 0.0
Realized and unrealized gains (losses), net    
Included in earnings 2.4 9.5
Included in other comprehensive income 0.0 0.0
Balance, end of period 63.7 93.2
Changes in unrealized gains (losses) included in earnings related to financial assets still held at the reporting date 5.1 8.6
Changes in unrealized gains (losses) included in other comprehensive income related to financial assets still held at the reporting date $ 0.0 $ 0.0