Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2020

Commitments and Contingencies Disclosure [Abstract]

Gas And Electric Supply Contractual Obligations

The following table lists the Company’s known specified gas and electric supply contractual obligations as of December 31, 2020.

			Payments Due by Period
Gas and Electric Supply Contractual Obligations (millions) as of December 31, 2020	Total		2021		2022		2023		2024		2025		2026 & Beyond
Gas Supply Contracts	$	556.2	$	55.9	$	49.3	$	46.5	$	37.6	$	36.2	$	330.7
Electric Supply Contracts		15.6		1.3		1.3		1.4		1.4		1.4		8.8
Total	$	571.8	$	57.2	$	50.6	$	47.9	$	39.0	$	37.6	$	339.5

Environmental Obligations Recognized by Company

The following table sets forth a summary of changes in the Company’s liability for the current and long-term portions of the Company’s environmental obligations, which are included in Other Current Liabilities and Other Noncurrent Liabilities, respectively, on the Company’s Consolidated Balance Sheets as of December 31, 2020 and 2019.

Environmental Obligations

	(millions)
	Fitchburg				Northern Utilities				Total
	2020		2019		2020		2019		2020		2019
Total Balance at Beginning of Period	$	—	$	—	$	2.7	$	2.0	$	2.7	$	2.0
Additions		0.1		—		0.1		0.9		0.2		0.9
Less: Payments / Reductions		—		—		0.8		0.2		0.8		0.2
Total Balance at End of Period	$	0.1	$	—	$	2.0	$	2.7	$	2.1	$	2.7
Less: Current Portion		0.1		—		0.2		0.6		0.3		0.6
Noncurrent Balance at December 31,	$	—	$	—	$	1.8	$	2.1	$	1.8	$	2.1