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Regulatory Matters (Details) - USD ($) $ in Millions		6 Months Ended	12 Months Ended			36 Months Ended
Regulatory Matters (Details) - USD ($) $ in Millions	Aug. 01, 2023	Mar. 31, 2025	Sep. 30, 2027	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2027	Nov. 01, 2025
NEW YORK \| Forecast
Regulatory Matters [Line Items]
Rate plan period						3 years
Approved Return on Equity (as a percent)						9.70%
Increase in annual revenue requirement in first year					$ 57.3
Additional increase in annual revenue requirement in second year				$ 15.8
Additional increase in annual revenue requirement in third year			$ 12.7
Reduction to annual revenue requirement for actuarial projections of pension and other-post retirement benefit income expected to be recognized			$ 14.0	$ 14.0	$ 14.0
PENNSYLVANIA
Regulatory Matters [Line Items]
Public utilities authorized rate increase, amount	$ 23.0
Public utilities distribution system improvement charge recovered from customers		$ 0.2
Empire \| Forecast
Regulatory Matters [Line Items]
FERC estimated annual reduction of revenue amount							$ 0.5