The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3255-108585

Name:	us-gaap_ProceedsFromIssuanceOfDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Debt - Debt Remarketing (Details) - USD ($)		9 Months Ended
Debt - Debt Remarketing (Details) - USD ($)	Aug. 18, 2020	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2017
Debt Instrument [Line Items]
Borrowings		$ 400,000,000	$ 0
St. John the Baptist Parish, State of Louisiana Revenue Bonds Due 2037
Debt Instrument [Line Items]
Borrowings	$ 400,000,000
Revenue refunding bond				$ 1,000,000,000