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Fair Value Measurement - Changes in Financial Assets Using Level III Inputs (Details)
$ in Millions
12 Months Ended
Dec. 31, 2024
USD ($)
fund
Dec. 31, 2023
USD ($)
fund
Realized and unrealized gains (losses), net    
Number of deconsolidated funds | fund 4 3
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 Investment income Investment income
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 Investment income Investment income
Other investments    
Realized and unrealized gains (losses), net    
Fair value, asset, recurring basis, unobservable input reconciliation, gain (loss), statement of income or comprehensive income Investment income Investment income
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 Investment income Investment income
Level III    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance, beginning of period $ 7,379.4 $ 6,983.9
Deconsolidation of funds (1,251.3) (449.5)
Purchases 7,442.9 2,806.2
Sales and distributions (3,639.8) (1,586.2)
Settlements (1,884.4) (748.6)
Realized and unrealized gains (losses), net    
Included in earnings 103.8 241.4
Included in other comprehensive income (218.1) 132.2
Balance, end of period 7,932.5 7,379.4
Changes in unrealized gains (losses) included in earnings related to financial assets still held at the reporting date 44.8 178.1
Changes in unrealized gains (losses) included in other comprehensive income related to financial assets still held at the reporting date (137.7) 125.0
Level III | Equity securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance, beginning of period 377.6 430.6
Deconsolidation of funds 0.0 (20.0)
Purchases 199.5 85.8
Sales and distributions (11.7) (104.5)
Settlements 0.0 0.0
Realized and unrealized gains (losses), net    
Included in earnings 6.6 (14.4)
Included in other comprehensive income 0.0 0.1
Balance, end of period 572.0 377.6
Changes in unrealized gains (losses) included in earnings related to financial assets still held at the reporting date 3.5 (15.7)
Changes in unrealized gains (losses) included in other comprehensive income related to financial assets still held at the reporting date 0.0 0.1
Level III | Bonds    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance, beginning of period 522.5 594.9
Deconsolidation of funds (34.1) 0.0
Purchases 335.3 168.9
Sales and distributions (343.4) (269.0)
Settlements (1.6) (8.2)
Realized and unrealized gains (losses), net    
Included in earnings 15.1 21.0
Included in other comprehensive income (28.7) 14.9
Balance, end of period 465.1 522.5
Changes in unrealized gains (losses) included in earnings related to financial assets still held at the reporting date 7.9 13.8
Changes in unrealized gains (losses) included in other comprehensive income related to financial assets still held at the reporting date (15.8) 12.4
Level III | Loans    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance, beginning of period 5,862.1 5,352.9
Deconsolidation of funds (1,219.5) (429.5)
Purchases 6,867.6 2,549.5
Sales and distributions (3,090.3) (1,151.2)
Settlements (1,882.8) (740.4)
Realized and unrealized gains (losses), net    
Included in earnings 78.2 182.7
Included in other comprehensive income (183.9) 98.1
Balance, end of period 6,431.4 5,862.1
Changes in unrealized gains (losses) included in earnings related to financial assets still held at the reporting date 33.4 131.5
Changes in unrealized gains (losses) included in other comprehensive income related to financial assets still held at the reporting date (115.7) 93.4
Level III | Investments in CLOs    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance, beginning of period 532.6 526.1
Deconsolidation of funds 2.3 0.0
Purchases 4.0 2.0
Sales and distributions (184.4) (58.0)
Settlements 0.0 0.0
Realized and unrealized gains (losses), net    
Included in earnings 29.9 43.4
Included in other comprehensive income (5.5) 19.1
Balance, end of period 378.9 532.6
Changes in unrealized gains (losses) included in earnings related to financial assets still held at the reporting date 29.0 43.3
Changes in unrealized gains (losses) included in other comprehensive income related to financial assets still held at the reporting date (6.2) 19.1
Level III | Other investments    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance, beginning of period 84.6 79.4
Deconsolidation of funds 0.0 0.0
Purchases 36.5 0.0
Sales and distributions (10.0) (3.5)
Settlements 0.0 0.0
Realized and unrealized gains (losses), net    
Included in earnings (26.0) 8.7
Included in other comprehensive income 0.0 0.0
Balance, end of period 85.1 84.6
Changes in unrealized gains (losses) included in earnings related to financial assets still held at the reporting date (29.0) 5.2
Changes in unrealized gains (losses) included in other comprehensive income related to financial assets still held at the reporting date $ 0.0 $ 0.0