Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2023

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, 2023.

			Payments Due by Period
Gas and Electric Supply Contractual Obligations (millions) as of December 31, 2023	Total		2024		2025		2026		2027		2028		2029 & Beyond
Gas Supply Contracts	$	479.2	$	79.9	$	45.7	$	44.3	$	43.8	$	39.1	$	226.4
Electric Supply Contracts		12.1		1.3		1.3		1.3		1.3		1.1		5.8
Total	$	491.3	$	81.2	$	47.0	$	45.6	$	45.1	$	40.2	$	232.2

Environmental Obligations Recognized by Company

The following table sets forth a summary of changes in the Company’s liability for Environmental Obligations for the years-ended December 31, 2023 and 2022.

	December 31,
Environmental Obligations (millions)	2023		2022
Total Balance at Beginning of Period	$	4.4	$	2.7
Additions		0.7		2.0
Less: Payments / Reductions		0.5		0.3
Total Balance at End of Period		4.6		4.4
Less: Current Portion		0.6		0.6
Noncurrent Balance at End of Period	$	4.0	$	3.8