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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 6 Months Ended
Jun. 30, 2025
USD ($)
fund
Jun. 30, 2024
USD ($)
Jun. 30, 2025
USD ($)
fund
Jun. 30, 2024
USD ($)
Realized and unrealized gains (losses), net        
Number of deconsolidated funds | fund 1   2  
Number of consolidated funds | fund     1  
Level III        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance, beginning of period $ 9,379.3 $ 7,566.6 $ 7,932.5 $ 7,379.4
Initial consolidation/deconsolidation of funds (477.4)   (284.5)  
Transfer out related to the Exchange     (50.4)  
Purchases 1,619.1 2,396.8 4,192.9 3,866.4
Sales and distributions (583.3) (911.7) (1,656.2) (1,745.0)
Settlements (350.8) (520.7) (709.7) (985.4)
Realized and unrealized gains (losses), net        
Included in earnings (15.1) 28.4 (1.6) 132.5
Included in other comprehensive income 305.9 (22.7) 454.7 (111.2)
Balance, end of period 9,877.7 8,536.7 9,877.7 8,536.7
Changes in unrealized gains (losses) included in earnings related to financial assets still held at the reporting date (16.0) 28.7 4.7 123.9
Changes in unrealized gains (losses) included in other comprehensive income related to financial assets still held at the reporting date 246.7 (21.6) 329.9 (88.2)
Level III | Equity securities        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance, beginning of period 821.7 387.3 572.0 377.6
Initial consolidation/deconsolidation of funds 0.0   0.0  
Transfer out related to the Exchange     0.0  
Purchases 74.6 38.2 327.8 63.0
Sales and distributions (19.5) (4.0) (28.5) (10.1)
Settlements 0.0 0.0 0.0 0.0
Realized and unrealized gains (losses), net        
Included in earnings 33.3 (1.5) 38.8 (10.5)
Included in other comprehensive income 0.0 0.0 0.0 0.0
Balance, end of period 910.1 420.0 910.1 420.0
Changes in unrealized gains (losses) included in earnings related to financial assets still held at the reporting date 32.8 (4.6) 37.3 (13.0)
Changes in unrealized gains (losses) included in other comprehensive income related to financial assets still held at the reporting date $ 0.0 $ 0.0 $ 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 $ 495.8 $ 500.4 $ 465.1 $ 522.5
Initial consolidation/deconsolidation of funds (76.6)   (52.6)  
Transfer out related to the Exchange     0.0  
Purchases 226.8 71.7 283.2 118.1
Sales and distributions (111.7) (70.0) (184.3) (142.8)
Settlements (0.6) 0.0 (0.6) 0.0
Realized and unrealized gains (losses), net        
Included in earnings (0.6) (9.7) 3.9 5.9
Included in other comprehensive income 36.6 (2.9) 55.0 (14.2)
Balance, end of period 569.7 489.5 569.7 489.5
Changes in unrealized gains (losses) included in earnings related to financial assets still held at the reporting date (1.3) (6.5) 1.4 8.6
Changes in unrealized gains (losses) included in other comprehensive income related to financial assets still held at the reporting date $ 27.9 $ (2.6) $ 34.5 $ (11.2)
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 $ 7,632.6 $ 6,064.9 $ 6,431.4 $ 5,862.1
Initial consolidation/deconsolidation of funds (424.0)   (256.1)  
Transfer out related to the Exchange     0.0  
Purchases 1,293.4 2,279.7 3,518.7 3,677.1
Sales and distributions (386.5) (801.2) (1,330.4) (1,530.7)
Settlements (350.2) (520.7) (709.1) (985.4)
Realized and unrealized gains (losses), net        
Included in earnings (50.0) 20.7 (60.9) 93.5
Included in other comprehensive income 249.4 (19.4) 371.1 (92.6)
Balance, end of period 7,964.7 7,024.0 7,964.7 7,024.0
Changes in unrealized gains (losses) included in earnings related to financial assets still held at the reporting date (52.4) 20.9 (54.2) 85.6
Changes in unrealized gains (losses) included in other comprehensive income related to financial assets still held at the reporting date $ 199.9 $ (18.6) $ 266.8 $ (72.6)
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 $ 365.5 $ 520.8 $ 378.9 $ 532.6
Initial consolidation/deconsolidation of funds 23.2   24.2  
Transfer out related to the Exchange     0.0  
Purchases 2.1 0.0 3.2 1.0
Sales and distributions (45.6) (36.5) (81.8) (60.5)
Settlements 0.0 0.0 0.0 0.0
Realized and unrealized gains (losses), net        
Included in earnings 1.8 10.7 13.8 25.9
Included in other comprehensive income 19.9 (0.4) 28.6 (4.4)
Balance, end of period 366.9 494.6 366.9 494.6
Changes in unrealized gains (losses) included in earnings related to financial assets still held at the reporting date 4.3 10.7 14.5 25.9
Changes in unrealized gains (losses) included in other comprehensive income related to financial assets still held at the reporting date $ 18.9 $ (0.4) $ 28.6 $ (4.4)
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 $ 63.7 $ 93.2 $ 85.1 $ 84.6
Initial consolidation/deconsolidation of funds 0.0   0.0  
Transfer out related to the Exchange     (50.4)  
Purchases 22.2 7.2 60.0 7.2
Sales and distributions (20.0) 0.0 (31.2) (0.9)
Settlements 0.0 0.0 0.0 0.0
Realized and unrealized gains (losses), net        
Included in earnings 0.4 8.2 2.8 17.7
Included in other comprehensive income 0.0 0.0 0.0 0.0
Balance, end of period 66.3 108.6 66.3 108.6
Changes in unrealized gains (losses) included in earnings related to financial assets still held at the reporting date 0.6 8.2 5.7 16.8
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