Property, Plant, and Equipment - PGL and NSG Impairment (Details) $ in Millions	1 Months Ended
Nov. 30, 2023 USD ($)
PGL
Property, plant, and equipment
Disallowance of improvements to service center capital costs	$ 177.2
NSG
Property, plant, and equipment
Disallowance of gas infrastructure project capital costs	1.7
PGL and NSG
Property, plant, and equipment
Non-cash impairment of PP&E	$ 178.9

Amount recognized as an operating expense or loss during the period to reduce the carrying amount of a project that has been impaired but not abandoned.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (b)
-SubTopic 10
-Topic 230
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482740/230-10-45-28

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482130/360-10-45-4

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