Fair Value Measurements - Narrative (Details)	Jun. 30, 2020
Level 1
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Investment portfolio percentage	13.30%
Level 2
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Investment portfolio percentage	86.30%

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