v3.26.1
Fair Value Measurement - Schedule of Changes in Level III Financial Assets Measured at Fair Value (Details)
$ in Millions
3 Months Ended
Mar. 31, 2026
USD ($)
fund
Mar. 31, 2025
USD ($)
fund
Realized and unrealized gains (losses), net    
Number of consolidated funds | fund 2 1
Number of deconsolidated funds | fund   1
Other investments    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Initial consolidation of funds   $ 0.0
Level III    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance, beginning of period $ 11,479.4 7,932.5
Initial consolidation of funds 379.3 192.9
Transfer out   (50.4)
Purchases 2,850.7 2,573.8
Sales and distributions (1,732.2) (1,072.9)
Settlements (439.2) (358.9)
Realized and unrealized gains (losses), net    
Included in earnings (220.7) 13.5
Included in other comprehensive income (70.0) 148.8
Balance, end of period 12,247.3 9,379.3
Changes in unrealized gains (losses) included in earnings related to financial assets still held at the reporting date (221.4) 24.9
Changes in unrealized gains (losses) included in other comprehensive income related to financial assets still held at the reporting date (64.0) 134.6
Level III | Equity securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance, beginning of period 1,094.8 572.0
Initial consolidation of funds 0.1 0.0
Transfer out   0.0
Purchases 45.5 253.2
Sales and distributions (261.1) (9.0)
Settlements 0.0 0.0
Realized and unrealized gains (losses), net    
Included in earnings (3.8) 5.5
Included in other comprehensive income 0.0 0.0
Balance, end of period 875.5 821.7
Changes in unrealized gains (losses) included in earnings related to financial assets still held at the reporting date (9.2) 4.8
Changes in unrealized gains (losses) included in other comprehensive income related to financial assets still held at the reporting date $ 0.0 $ 0.0
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 | Bonds    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance, beginning of period $ 691.2 $ 465.1
Initial consolidation of funds 17.5 24.0
Transfer out   0.0
Purchases 161.3 56.4
Sales and distributions (94.4) (72.6)
Settlements 0.0 0.0
Realized and unrealized gains (losses), net    
Included in earnings (9.8) 4.5
Included in other comprehensive income (9.6) 18.4
Balance, end of period 756.2 495.8
Changes in unrealized gains (losses) included in earnings related to financial assets still held at the reporting date (7.5) 4.2
Changes in unrealized gains (losses) included in other comprehensive income related to financial assets still held at the reporting date $ (8.2) $ 15.5
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
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 | Loans    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance, beginning of period $ 9,249.8 $ 6,431.4
Initial consolidation of funds 361.7 167.9
Transfer out   0.0
Purchases 2,642.9 2,225.3
Sales and distributions (1,339.7) (943.9)
Settlements (439.2) (358.9)
Realized and unrealized gains (losses), net    
Included in earnings (205.5) (10.9)
Included in other comprehensive income (55.3) 121.7
Balance, end of period 10,214.7 7,632.6
Changes in unrealized gains (losses) included in earnings related to financial assets still held at the reporting date (200.1) 0.6
Changes in unrealized gains (losses) included in other comprehensive income related to financial assets still held at the reporting date $ (50.5) $ 109.4
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
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 | Investments in CLOs    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance, beginning of period $ 349.0 $ 378.9
Initial consolidation of funds 0.0 1.0
Transfer out   0.0
Purchases 1.0 1.1
Sales and distributions (34.2) (36.2)
Settlements 0.0 0.0
Realized and unrealized gains (losses), net    
Included in earnings (0.8) 12.0
Included in other comprehensive income (5.1) 8.7
Balance, end of period 309.9 365.5
Changes in unrealized gains (losses) included in earnings related to financial assets still held at the reporting date (3.9) 10.2
Changes in unrealized gains (losses) included in other comprehensive income related to financial assets still held at the reporting date $ (5.3) $ 9.7
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 | Other investments    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance, beginning of period $ 94.6 $ 85.1
Initial consolidation of funds 0.0  
Transfer out   (50.4)
Purchases 0.0 37.8
Sales and distributions (2.8) (11.2)
Settlements 0.0 0.0
Realized and unrealized gains (losses), net    
Included in earnings (0.8) 2.4
Included in other comprehensive income 0.0 0.0
Balance, end of period 91.0 63.7
Changes in unrealized gains (losses) included in earnings related to financial assets still held at the reporting date (0.7) 5.1
Changes in unrealized gains (losses) included in other comprehensive income related to financial assets still held at the reporting date $ 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
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