Commitments and Contingencies (Details) $ in Millions	Dec. 31, 2019 USD ($)
Loss Contingencies [Line Items]
Undrawn capital and purchase commitments for unconsolidated ventures sponsored by an affiliate	$ 6.5
Loan Participation Interest
Loss Contingencies [Line Items]
Unfunded commitment	$ 30.3

The amount of unfunded commitments for which the entity is obligated, to those certain investments for which net asset value per share is calculated (including by unit, membership interest, or other equity (ownership interest) unit measure) (alternative investments).

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 6A
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=SL6742756-110258

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant