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Fair Value Measurement - Changes in Financial Assets Using Level III Inputs (Details)
$ in Millions
12 Months Ended
Dec. 31, 2023
USD ($)
collateralized_Loan_obligation
Dec. 31, 2022
USD ($)
collateralized_Loan_obligation
Realized and unrealized gains (losses), net    
Number of CLOs consolidated during period | collateralized_Loan_obligation 3 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 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 $ 6,983.9 $ 6,955.3
Deconsolidation of funds (449.5) (47.7)
Purchases 2,806.2 3,751.2
Sales and distributions (1,586.2) (2,219.4)
Settlements (748.6) (651.4)
Realized and unrealized gains (losses), net    
Included in earnings 241.4 (485.2)
Included in other comprehensive income 132.2 (318.9)
Balance, end of period 7,379.4 6,983.9
Changes in unrealized gains (losses) included in earnings related to financial assets still held at the reporting date 178.1 (478.5)
Changes in unrealized gains (losses) included in other comprehensive income related to financial assets still held at the reporting date 125.0 (210.5)
Level III | Equity securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance, beginning of period 430.6 17.9
Deconsolidation of funds (20.0) (47.7)
Purchases 85.8 486.5
Sales and distributions (104.5) (14.5)
Settlements 0.0 0.0
Realized and unrealized gains (losses), net    
Included in earnings (14.4) (10.9)
Included in other comprehensive income 0.1 (0.7)
Balance, end of period 377.6 430.6
Changes in unrealized gains (losses) included in earnings related to financial assets still held at the reporting date (15.7) (16.4)
Changes in unrealized gains (losses) included in other comprehensive income related to financial assets still held at the reporting date 0.1 (0.6)
Level III | Bonds    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance, beginning of period 594.9 599.5
Deconsolidation of funds 0.0 0.0
Purchases 168.9 515.4
Sales and distributions (269.0) (419.6)
Settlements (8.2) (1.6)
Realized and unrealized gains (losses), net    
Included in earnings 21.0 (60.5)
Included in other comprehensive income 14.9 (38.3)
Balance, end of period 522.5 594.9
Changes in unrealized gains (losses) included in earnings related to financial assets still held at the reporting date 13.8 (56.9)
Changes in unrealized gains (losses) included in other comprehensive income related to financial assets still held at the reporting date 12.4 (16.5)
Level III | Loans    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance, beginning of period 5,352.9 5,898.1
Deconsolidation of funds (429.5) 0.0
Purchases 2,549.5 2,485.0
Sales and distributions (1,151.2) (1,738.7)
Settlements (740.4) (649.8)
Realized and unrealized gains (losses), net    
Included in earnings 182.7 (392.7)
Included in other comprehensive income 98.1 (249.0)
Balance, end of period 5,862.1 5,352.9
Changes in unrealized gains (losses) included in earnings related to financial assets still held at the reporting date 131.5 (380.6)
Changes in unrealized gains (losses) included in other comprehensive income related to financial assets still held at the reporting date 93.4 (162.5)
Level III | Investments in CLOs    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance, beginning of period 526.1 361.1
Deconsolidation of funds 0.0 0.0
Purchases 2.0 263.4
Sales and distributions (58.0) (41.9)
Settlements 0.0 0.0
Realized and unrealized gains (losses), net    
Included in earnings 43.4 (25.6)
Included in other comprehensive income 19.1 (30.9)
Balance, end of period 532.6 526.1
Changes in unrealized gains (losses) included in earnings related to financial assets still held at the reporting date 43.3 (25.6)
Changes in unrealized gains (losses) included in other comprehensive income related to financial assets still held at the reporting date 19.1 (30.9)
Level III | Other investments    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance, beginning of period 79.4 78.7
Deconsolidation of funds 0.0 0.0
Purchases 0.0 0.9
Sales and distributions (3.5) (4.7)
Settlements 0.0 0.0
Realized and unrealized gains (losses), net    
Included in earnings 8.7 4.5
Included in other comprehensive income 0.0 0.0
Balance, end of period 84.6 79.4
Changes in unrealized gains (losses) included in earnings related to financial assets still held at the reporting date 5.2 1.0
Changes in unrealized gains (losses) included in other comprehensive income related to financial assets still held at the reporting date $ 0.0 $ 0.0