Fair Value - Narratives (Details)	Dec. 31, 2020
BFTR, LLC
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investment percentage (as a percent)	18.00%

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

Name:	us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration