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Fair Value Measurement - Schedule of Changes in Level III Financial Assets Measured at Fair Value (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2025
USD ($)
fund
Sep. 30, 2024
USD ($)
fund
Sep. 30, 2025
USD ($)
fund
Sep. 30, 2024
USD ($)
fund
Realized and unrealized gains (losses), net        
Number of consolidated funds | fund 3   4  
Number of deconsolidated funds | fund 1 3 2 3
Other investments        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Initial consolidation/deconsolidation of funds   $ 0.0   $ 0.0
Level III        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance, beginning of period $ 9,877.7 8,536.7 $ 7,932.5 7,379.4
Initial consolidation/deconsolidation of funds (1,009.0) (1,222.1) (1,293.5) (1,222.1)
Transfer out related to the Exchange     (50.4)  
Purchases 3,960.9 1,113.0 8,153.8 4,979.4
Sales and distributions (2,214.5) (494.5) (3,870.7) (2,239.5)
Settlements (529.3) (570.2) (1,239.0) (1,555.6)
Realized and unrealized gains (losses), net        
Included in earnings (25.3) (84.3) (26.9) 48.2
Included in other comprehensive income (5.5) 149.8 449.2 38.6
Balance, end of period 10,055.0 7,428.4 10,055.0 7,428.4
Changes in unrealized gains (losses) included in earnings related to financial assets still held at the reporting date (35.6) (83.5) (24.4) (12.3)
Changes in unrealized gains (losses) included in other comprehensive income related to financial assets still held at the reporting date (3.2) 129.7 244.0 37.5
Level III | Equity securities        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance, beginning of period 910.1 420.0 572.0 377.6
Initial consolidation/deconsolidation of funds 0.0 0.0 0.0 0.0
Transfer out related to the Exchange     0.0  
Purchases 78.6 76.7 406.4 139.7
Sales and distributions (11.1) (1.2) (39.6) (11.3)
Settlements 0.0 0.0 0.0 0.0
Realized and unrealized gains (losses), net        
Included in earnings (34.1) (8.6) 4.7 (19.1)
Included in other comprehensive income 0.0 0.0 0.0 0.0
Balance, end of period 943.5 486.9 943.5 486.9
Changes in unrealized gains (losses) included in earnings related to financial assets still held at the reporting date (39.2) (9.4) (1.9) (22.2)
Changes in unrealized gains (losses) included in other comprehensive income related to financial assets still held at the reporting date $ 0.0 $ 0.0 $ 0.0 $ 0.0
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 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 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 Net investment income (loss) of Consolidated Funds Net investment income (loss) of Consolidated Funds
Level III | Bonds        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance, beginning of period $ 569.7 $ 489.5 $ 465.1 $ 522.5
Initial consolidation/deconsolidation of funds (87.7) (34.1) (140.3) (34.1)
Transfer out related to the Exchange     0.0  
Purchases 253.0 147.0 536.2 265.1
Sales and distributions (102.8) (123.1) (287.1) (265.9)
Settlements 0.0 0.0 (0.6) 0.0
Realized and unrealized gains (losses), net        
Included in earnings 2.5 7.4 6.4 13.3
Included in other comprehensive income (0.1) 16.4 54.9 2.2
Balance, end of period 634.6 503.1 634.6 503.1
Changes in unrealized gains (losses) included in earnings related to financial assets still held at the reporting date 1.0 5.6 2.8 9.8
Changes in unrealized gains (losses) included in other comprehensive income related to financial assets still held at the reporting date $ 0.1 $ 13.2 $ 26.3 $ 2.5
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 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 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 Net investment income (loss) of Consolidated Funds Net investment income (loss) of Consolidated Funds
Level III | Loans        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance, beginning of period $ 7,964.7 $ 7,024.0 $ 6,431.4 $ 5,862.1
Initial consolidation/deconsolidation of funds (920.6) (1,190.3) (1,176.7) (1,190.3)
Transfer out related to the Exchange     0.0  
Purchases 3,601.0 888.5 7,119.7 4,565.6
Sales and distributions (2,023.6) (310.9) (3,354.0) (1,841.6)
Settlements (529.3) (570.2) (1,238.4) (1,555.6)
Realized and unrealized gains (losses), net        
Included in earnings (1.8) (33.4) (62.7) 60.1
Included in other comprehensive income (0.9) 112.8 370.2 20.2
Balance, end of period 8,089.5 5,920.5 8,089.5 5,920.5
Changes in unrealized gains (losses) included in earnings related to financial assets still held at the reporting date (1.0) (28.0) (49.1) 9.1
Changes in unrealized gains (losses) included in other comprehensive income related to financial assets still held at the reporting date $ 0.6 $ 96.7 $ 193.0 $ 19.6
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 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 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 Net investment income (loss) of Consolidated Funds Net investment income (loss) of Consolidated Funds
Level III | Investments in CLOs        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance, beginning of period $ 366.9 $ 494.6 $ 378.9 $ 532.6
Initial consolidation/deconsolidation of funds (0.7) 2.3 23.5 2.3
Transfer out related to the Exchange     0.0  
Purchases 27.7 0.8 30.9 1.8
Sales and distributions (18.8) (51.1) (100.6) (111.6)
Settlements 0.0 0.0 0.0 0.0
Realized and unrealized gains (losses), net        
Included in earnings 10.1 (2.7) 23.9 23.2
Included in other comprehensive income (4.5) 20.6 24.1 16.2
Balance, end of period 380.7 464.5 380.7 464.5
Changes in unrealized gains (losses) included in earnings related to financial assets still held at the reporting date 8.3 (3.6) 22.8 22.3
Changes in unrealized gains (losses) included in other comprehensive income related to financial assets still held at the reporting date $ (3.9) $ 19.8 $ 24.7 $ 15.4
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 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 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 Net investment income (loss) of Consolidated Funds Net investment income (loss) of Consolidated Funds
Level III | Other investments        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance, beginning of period $ 66.3 $ 108.6 $ 85.1 $ 84.6
Initial consolidation/deconsolidation of funds 0.0   0.0  
Transfer out related to the Exchange     (50.4)  
Purchases 0.6 0.0 60.6 7.2
Sales and distributions (58.2) (8.2) (89.4) (9.1)
Settlements 0.0 0.0 0.0 0.0
Realized and unrealized gains (losses), net        
Included in earnings (2.0) (47.0) 0.8 (29.3)
Included in other comprehensive income 0.0 0.0 0.0 0.0
Balance, end of period 6.7 53.4 6.7 53.4
Changes in unrealized gains (losses) included in earnings related to financial assets still held at the reporting date (4.7) (48.1) 1.0 (31.3)
Changes in unrealized gains (losses) included in other comprehensive income related to financial assets still held at the reporting date $ 0.0 $ 0.0 $ 0.0 $ 0.0
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 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 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 Net investment income (loss) of Consolidated Funds Net investment income (loss) of Consolidated Funds