Subsequent Event - Additional Information (Details) - Subsequent Event [Member] - Variable Rate Green Bonds [Member] $ in Millions	Jul. 27, 2020 USD ($)
Subsequent Event [Line Items]
Debt instrument, issuance date	Jul. 27, 2020
Issuance of bonds	$ 162.6
Debt instrument, term	40 years

Date the debt instrument was issued, in CCYY-MM-DD format.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Name:	us-gaap_DebtInstrumentIssuanceDate1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration