Regulatory Matters (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2022	Sep. 30, 2022
NEW YORK
Regulatory Matters [Line Items]
Approved Return on Equity	8.70%
Authorized Annual Recovery from Customers for Pension and OPEB Expense		$ 15.0
PENNSYLVANIA
Regulatory Matters [Line Items]
Proposed Base Rate Increase	$ 28.1
Approved Base Rate Reduction related to OPEB Expenses		(7.7)
Proposed Refund to Customers from Over-Collection of OPEB Expenses		50.0
Reduction of Other Post-Retirement Regulatory Liability		(18.5)
Approved Refund to Customers from Over-Collection of OPEB Expenses		$ 54.0