Consolidated Investment Entities - Fair Value Hierarchy (Details) - Measured at fair value on a recurring basis - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Net Asset Value (NAV)	$ 1,459.0	$ 1,632.0
Assets, Including NAV	1,772.0	2,213.0
Liabilities	268.0	474.0
Cash and cash equivalents \| VIEs
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets	39.0	68.0
Corporate loans, at fair value using the fair value option \| VIEs
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets	274.0	513.0
Limited partnerships/corporations, at fair value \| VIEs
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Net Asset Value (NAV)	1,459.0	1,470.0
Assets, Including NAV	1,459.0	1,470.0
Limited partnerships/corporations, at fair value \| VOEs
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, Net Asset Value (NAV)	0.0	162.0
Assets, Including NAV	0.0	162.0
CLO notes, at fair value using the fair value option \| VIEs
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities	268.0	474.0
Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets	39.0	68.0
Liabilities	0.0	0.0
Level 1 \| Cash and cash equivalents \| VIEs
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets	39.0	68.0
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
Level 1 \| Limited partnerships/corporations, at fair value \| VIEs
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets	0.0	0.0
Level 1 \| Limited partnerships/corporations, at fair value \| VOEs
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets	0.0	0.0
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
Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets	274.0	513.0
Liabilities	268.0	474.0
Level 2 \| Cash and cash equivalents \| VIEs
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets	0.0	0.0
Level 2 \| Corporate loans, at fair value using the fair value option \| VIEs
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets	274.0	513.0
Level 2 \| Limited partnerships/corporations, at fair value \| VIEs
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets	0.0	0.0
Level 2 \| Limited partnerships/corporations, at fair value \| VOEs
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets	0.0	0.0
Level 2 \| CLO notes, at fair value using the fair value option \| VIEs
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities	268.0	474.0
Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets	0.0	0.0
Liabilities	0.0	0.0
Level 3 \| Cash and cash equivalents \| VIEs
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets	0.0	0.0
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
Level 3 \| Limited partnerships/corporations, at fair value \| VIEs
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets	0.0	0.0
Level 3 \| Limited partnerships/corporations, at fair value \| VOEs
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets	0.0	0.0
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 http://asc.fasb.org/extlink&oid=117815213&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 http://asc.fasb.org/extlink&oid=117332851&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.

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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 http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

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Fair value of financial and nonfinancial obligations.

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Investments, Including Net Asset Value, Fair Value Disclosure

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