Fair Value Measurement - Changes in Financial Liabilities Using Level III Inputs (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Borrowings	$ 12.0	$ 73.2	$ 111.7
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
Level III
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	$ 5,491.6	$ 5,811.0
Borrowings	903.0	1,603.1
Paydowns	(159.6)	(421.0)
Sales	(290.8)	(892.4)
Realized and unrealized gains (losses), net
Included in earnings	239.7	(366.6)
Included in other comprehensive income	114.7	(242.5)
Balance, end of period	6,298.6	5,491.6	$ 5,811.0
Changes in unrealized (gains) losses included in earnings related to financial liabilities still held at the reporting date	250.1	(364.2)
Changes in unrealized (gains) losses included in other comprehensive income related to financial liabilities still held at the reporting date	$ 112.4	$ (239.6)

Paydowns related to the financial liability that is measured at fair value using significant unobservable inputs.

No definition available.

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- Definition

Financial Liabilities, Fair Value, Measured On Recurring Basis, Gain (Loss) Included In Earnings

+ References

No definition available.

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- Definition

Financial Liabilities, Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Gain (Loss) Included in Other Comprehensive Income (Loss)

+ References

No definition available.

+ Details

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- References

No definition available.

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- Definition

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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- Definition

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.

+ References

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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- Definition

Amount of gain (loss) recognized in income 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
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(1)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482106/820-10-50-2

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- Definition

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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482106/820-10-50-2

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- Definition

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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)
-SubTopic 10
-Topic 820
-Publisher FASB
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- Definition

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).

+ References

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- Definition

The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 14
-Subparagraph (b)
-Publisher FASB
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