Fair Value Measurement - Changes in Financial Assets Using Level III Inputs (Details) $ in Millions	12 Months Ended
Dec. 31, 2022 USD ($) collateralized_Loan_obligation	Dec. 31, 2021 USD ($) collateralized_Loan_obligation
Realized and unrealized gains (losses), net
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
Number of CLOs consolidated during period \| collateralized_Loan_obligation	1	2
Number of CLOs deconsolidated during period \| collateralized_Loan_obligation		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 gains (losses) of Consolidated Funds	Net investment gains (losses) of Consolidated Funds
Fair value, asset, recurring basis, still held, unrealized gain (loss), statement of income or comprehensive income	Net investment gains (losses) of Consolidated Funds	Net investment gains (losses) 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 gains (losses) of Consolidated Funds	Net investment gains (losses) of Consolidated Funds
Fair value, asset, recurring basis, still held, unrealized gain (loss), statement of income or comprehensive income	Net investment gains (losses) of Consolidated Funds	Net investment gains (losses) 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 gains (losses) of Consolidated Funds	Net investment gains (losses) of Consolidated Funds
Fair value, asset, recurring basis, still held, unrealized gain (loss), statement of income or comprehensive income	Net investment gains (losses) of Consolidated Funds	Net investment gains (losses) 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, still held, unrealized gain (loss), statement of income or comprehensive income	Investment income	Investment income
Other
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, 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	$ 6,955.3	$ 6,627.7
Deconsolidation/consolidation of funds	(47.7)	343.0
Purchases	3,751.2	5,363.8
Sales and distributions	(2,219.4)	(3,805.3)
Settlements	(651.4)	(1,350.6)
Realized and unrealized gains (losses), net
Included in earnings	(485.2)	101.1
Included in other comprehensive income	(318.9)	(324.4)
Balance, end of period	6,983.9	6,955.3
Changes in unrealized gains (losses) included in earnings related to financial assets still held at the reporting date	(478.5)	47.0
Changes in unrealized gains (losses) included in other comprehensive income related to financial assets still held at the reporting date	(210.5)	(172.1)
Level III \| Equity securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	17.9	9.4
Deconsolidation/consolidation of funds	(47.7)	5.7
Purchases	486.5	0.5
Sales and distributions	(14.5)	(4.0)
Settlements	0.0	0.0
Realized and unrealized gains (losses), net
Included in earnings	(10.9)	7.0
Included in other comprehensive income	(0.7)	(0.7)
Balance, end of period	430.6	17.9
Changes in unrealized gains (losses) included in earnings related to financial assets still held at the reporting date	(16.4)	4.4
Changes in unrealized gains (losses) included in other comprehensive income related to financial assets still held at the reporting date	(0.6)	(0.4)
Level III \| Bonds
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	599.5	550.4
Deconsolidation/consolidation of funds	0.0	0.0
Purchases	515.4	729.6
Sales and distributions	(419.6)	(629.1)
Settlements	(1.6)	(3.8)
Realized and unrealized gains (losses), net
Included in earnings	(60.5)	(7.5)
Included in other comprehensive income	(38.3)	(40.1)
Balance, end of period	594.9	599.5
Changes in unrealized gains (losses) included in earnings related to financial assets still held at the reporting date	(56.9)	(0.9)
Changes in unrealized gains (losses) included in other comprehensive income related to financial assets still held at the reporting date	(16.5)	(13.9)
Level III \| Loans
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	5,898.1	5,497.1
Deconsolidation/consolidation of funds	0.0	314.2
Purchases	2,485.0	4,530.6
Sales and distributions	(1,738.7)	(2,903.5)
Settlements	(649.8)	(1,346.8)
Realized and unrealized gains (losses), net
Included in earnings	(392.7)	88.0
Included in other comprehensive income	(249.0)	(281.5)
Balance, end of period	5,352.9	5,898.1
Changes in unrealized gains (losses) included in earnings related to financial assets still held at the reporting date	(380.6)	30.1
Changes in unrealized gains (losses) included in other comprehensive income related to financial assets still held at the reporting date	(162.5)	(155.7)
Level III \| Investments in CLOs
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	361.1	489.4
Deconsolidation/consolidation of funds	0.0	23.1
Purchases	263.4	102.4
Sales and distributions	(41.9)	(250.9)
Settlements	0.0	0.0
Realized and unrealized gains (losses), net
Included in earnings	(25.6)	(0.8)
Included in other comprehensive income	(30.9)	(2.1)
Balance, end of period	526.1	361.1
Changes in unrealized gains (losses) included in earnings related to financial assets still held at the reporting date	(25.6)	(1.2)
Changes in unrealized gains (losses) included in other comprehensive income related to financial assets still held at the reporting date	(30.9)	(2.1)
Level III \| Other
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	78.7	81.4
Deconsolidation/consolidation of funds	0.0	0.0
Purchases	0.9	0.7
Sales and distributions	(4.7)	(17.8)
Settlements	0.0	0.0
Realized and unrealized gains (losses), net
Included in earnings	4.5	14.4
Included in other comprehensive income	0.0	0.0
Balance, end of period	79.4	78.7
Changes in unrealized gains (losses) included in earnings related to financial assets still held at the reporting date	1.0	14.6
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 Measurement Unobservable Input Consolidation (Deconsolidation)

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Number Of CLOs Consolidated During Period

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Amount of unrealized gain (loss) recognized in other comprehensive income (OCI) from asset measured at fair value on recurring basis using unobservable input (level 3) and still held.

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Amount of unrealized gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3) and still held.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3).

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Amount of gain (loss) recognized in other comprehensive income (OCI) from asset measured at fair value on recurring basis using unobservable input (level 3).

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Amount of purchases of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of sale of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of settlement of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Indicates line item in statement in which net income is reported that includes gain (loss) from asset measured at fair value using unobservable input (level 3).

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