Fair Value Measurement - Level III Financial Liabilities Measured at Fair Value (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Realized and unrealized (gains) losses, net
Fair value, liability, 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	Net investment income (loss) of Consolidated Funds	Net investment income (loss) of Consolidated Funds
Level III \| Loans Payable of Consolidated Funds
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	$ 5,647.9	$ 5,682.1	$ 5,491.6	$ 5,811.0
Borrowings	869.2	462.9	869.8	1,571.3
Paydowns	(46.9)	(1.9)	(49.0)	(417.3)
Sales	(82.5)	0.0	(120.6)	(669.5)
Realized and unrealized (gains) losses, net
Included in earnings	(19.7)	(181.3)	121.7	(227.5)
Included in other comprehensive income	15.9	(204.0)	70.4	(310.2)
Balance, end of period	6,383.9	5,757.8	6,383.9	5,757.8
Changes in unrealized (gains) losses included in earnings related to financial liabilities still held at the reporting date	(18.1)	(181.3)	126.7	(230.8)
Changes in unrealized (gains) losses included in other comprehensive income related to financial liabilities still held at the reporting date	$ 16.1	$ (210.9)	$ 68.3	$ (320.2)

No definition available.

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- Definition

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

+ References

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-Topic 820
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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.

+ References

No definition available.

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

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
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-Name Accounting Standards Codification
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- Definition

Amount of issuances of financial instrument classified as a liability 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 sales of financial instrument classified as a liability 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 settlements of financial instrument classified as a liability 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 a liability 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 liability measured at fair value using unobservable input (level 3).

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