Fair Value Measurement - Changes in Level III Financial Assets Measured at Fair Value (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2024	Mar. 31, 2023
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	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
Other investments
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
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
Purchases	1,469.6	272.5
Sales and distributions	(833.3)	(225.5)
Settlements	(464.7)	(105.7)
Realized and unrealized gains (losses), net
Included in earnings	104.1	143.6
Included in other comprehensive income	(88.5)	62.5
Balance, end of period	7,566.6	7,131.3
Changes in unrealized gains (losses) included in earnings related to financial assets still held at the reporting date	92.0	131.2
Changes in unrealized gains (losses) included in other comprehensive income related to financial assets still held at the reporting date	(83.1)	64.8
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
Purchases	24.8	5.4
Sales and distributions	(6.1)	0.0
Settlements	0.0	0.0
Realized and unrealized gains (losses), net
Included in earnings	(9.0)	(0.5)
Included in other comprehensive income	0.0	0.0
Balance, end of period	387.3	435.5
Changes in unrealized gains (losses) included in earnings related to financial assets still held at the reporting date	(9.0)	(0.4)
Changes in unrealized gains (losses) included in other comprehensive income related to financial assets still held at the reporting date	0.0	0.0
Level III \| Bonds
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	522.5	594.9
Purchases	46.4	29.8
Sales and distributions	(72.8)	(47.0)
Settlements	0.0	(4.1)
Realized and unrealized gains (losses), net
Included in earnings	15.6	11.4
Included in other comprehensive income	(11.3)	8.2
Balance, end of period	500.4	593.2
Changes in unrealized gains (losses) included in earnings related to financial assets still held at the reporting date	16.4	8.5
Changes in unrealized gains (losses) included in other comprehensive income related to financial assets still held at the reporting date	(10.2)	8.7
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
Purchases	1,397.4	237.3
Sales and distributions	(729.5)	(169.7)
Settlements	(464.7)	(101.6)
Realized and unrealized gains (losses), net
Included in earnings	72.8	116.0
Included in other comprehensive income	(73.2)	46.8
Balance, end of period	6,064.9	5,481.7
Changes in unrealized gains (losses) included in earnings related to financial assets still held at the reporting date	60.8	107.3
Changes in unrealized gains (losses) included in other comprehensive income related to financial assets still held at the reporting date	(68.9)	48.6
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
Purchases	1.0	0.0
Sales and distributions	(24.0)	(7.9)
Settlements	0.0	0.0
Realized and unrealized gains (losses), net
Included in earnings	15.2	19.1
Included in other comprehensive income	(4.0)	7.5
Balance, end of period	520.8	544.8
Changes in unrealized gains (losses) included in earnings related to financial assets still held at the reporting date	15.2	19.1
Changes in unrealized gains (losses) included in other comprehensive income related to financial assets still held at the reporting date	(4.0)	7.5
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
Purchases	0.0	0.0
Sales and distributions	(0.9)	(0.9)
Settlements	0.0	0.0
Realized and unrealized gains (losses), net
Included in earnings	9.5	(2.4)
Included in other comprehensive income	0.0	0.0
Balance, end of period	93.2	76.1
Changes in unrealized gains (losses) included in earnings related to financial assets still held at the reporting date	8.6	(3.3)
Changes in unrealized gains (losses) included in other comprehensive income related to financial assets still held at the reporting date	$ 0.0	$ 0.0

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.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482106/820-10-50-2

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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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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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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-SubTopic 10
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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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-Topic 820
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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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