Consolidated and Nonconsolidated Investment Entities - Fair Value Hierarchy (Details) - USD ($) $ in Millions	9 Months Ended
Sep. 30, 2022	Dec. 31, 2021
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net	$ 0.0
Measured at fair value on a recurring basis
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Net Asset Value (NAV)	2,879.0	$ 2,469.0
Assets, Including NAV	4,135.0	3,751.0
Liabilities	1,028.0	880.0
Measured at fair value on a recurring basis \| VIEs
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Net Asset Value (NAV)	0.0	0.0
Measured at fair value on a recurring basis \| Cash and cash equivalents \| VIEs
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets	95.0	171.0
Assets, Net Asset Value (NAV)	0.0	0.0
Measured at fair value on a recurring basis \| Corporate loans, at fair value using the fair value option \| VIEs
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets	1,161.0	1,111.0
Assets, Net Asset Value (NAV)	0.0	0.0
Measured at fair value on a recurring basis \| Limited partnerships/corporations, at fair value \| VIEs
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Net Asset Value (NAV)	2,879.0	2,469.0
Assets, Including NAV	2,879.0	2,469.0
Measured at fair value on a recurring basis \| CLO notes, at fair value using the fair value option \| VIEs
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Net Asset Value (NAV)	0.0	0.0
Liabilities	1,028.0	880.0
Measured at fair value on a recurring basis \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets	95.0	171.0
Liabilities	0.0	0.0
Measured at fair value on a recurring basis \| Level 1 \| Cash and cash equivalents \| VIEs
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets	95.0	171.0
Measured at fair value on a recurring basis \| Level 1 \| Corporate loans, at fair value using the fair value option \| VIEs
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets	0.0	0.0
Measured at fair value on a recurring basis \| Level 1 \| Limited partnerships/corporations, at fair value \| VIEs
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets	0.0	0.0
Measured at fair value on a recurring basis \| Level 1 \| CLO notes, at fair value using the fair value option \| VIEs
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities	0.0	0.0
Measured at fair value on a recurring basis \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets	1,161.0	1,111.0
Liabilities	1,028.0	880.0
Measured at fair value on a recurring basis \| Level 2 \| Cash and cash equivalents \| VIEs
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets	0.0	0.0
Measured at fair value on a recurring basis \| Level 2 \| Corporate loans, at fair value using the fair value option \| VIEs
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets	1,161.0	1,111.0
Measured at fair value on a recurring basis \| Level 2 \| Limited partnerships/corporations, at fair value \| VIEs
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets	0.0	0.0
Measured at fair value on a recurring basis \| Level 2 \| CLO notes, at fair value using the fair value option \| VIEs
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities	1,028.0	880.0
Measured at fair value on a recurring basis \| Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets	0.0	0.0
Liabilities	0.0	0.0
Measured at fair value on a recurring basis \| Level 3 \| Cash and cash equivalents \| VIEs
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets	0.0	0.0
Measured at fair value on a recurring basis \| Level 3 \| Corporate loans, at fair value using the fair value option \| VIEs
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets	0.0	0.0
Measured at fair value on a recurring basis \| Level 3 \| Limited partnerships/corporations, at fair value \| VIEs
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets	0.0	0.0
Measured at fair value on a recurring basis \| Level 3 \| CLO notes, at fair value using the fair value option \| VIEs
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities	$ 0.0	$ 0.0

Fair value of investment other than investment in equity security, investment in debt security and equity method investment. Includes, but is not limited to, investment in certain entities that calculate net asset value per share. Example includes, but is not limited to, investment in hedge fund, venture capital fund, private equity fund, and real estate partnership or fund.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 6A
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126976982&loc=SL6742756-110258

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 35
-Paragraph 54B
-URI https://asc.fasb.org/extlink&oid=126972413&loc=SL7495116-110257

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- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258

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Amount of transfer of financial instrument classified as an asset into (out of) level 3 of the fair value hierarchy.

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Fair value of financial and nonfinancial obligations.

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