Regulatory Matters (Details) - USD ($) $ in Millions					86 Months Ended
	Mar. 27, 2024	Oct. 31, 2023	Aug. 01, 2023	Oct. 28, 2022	Jun. 30, 2024	Jul. 31, 2024
Supply Corporation
Regulatory Matters [Line Items]
Estimated Annual Increase to Revenues	$ 56.0
NEW YORK
Regulatory Matters [Line Items]
Approved Return on Equity (as a percent)					8.70%
Proposed Base Rate Increase		$ 88.0
PENNSYLVANIA
Regulatory Matters [Line Items]
Proposed Base Rate Increase				$ 28.1
Public Utilities Authorized Rate Increase, Amount			$ 23.0
Public Utilities, Distribution System Improvement Charge, Plant					$ 763.7
PENNSYLVANIA | Minimum | Subsequent Event
Regulatory Matters [Line Items]
Public Utilities, Distribution System Improvement Charge, Plant						$ 781.3