Regulatory Matters - Rate Plans (Details) - O&R - NYSPSC $ in Millions	1 Months Ended
	Mar. 31, 2021 USD ($)
Electric
Public Utilities, General Disclosures [Line Items]
Approved rate increase (decrease)	$ 3.3
Approved rate	27.8
Gas
Public Utilities, General Disclosures [Line Items]
Approved rate increase (decrease)	(8.6)
Approved rate	$ 1.2