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Regulatory Matters (Tables)

9 Months Ended

Sep. 30, 2022

Regulated Operations [Abstract]

Regulatory Assets and Liabilities [Table Text Block]

Regulatory Assets and Liabilities			September 30, 2022						December 31, 2021
Millions
Current Regulatory Assets (a)
Fuel Adjustment Clause			$38.7						—
Total Current Regulatory Assets			38.7						—
Non-Current Regulatory Assets
Defined Benefit Pension and Other Postretirement Benefit Plans			217.0						$226.4
Income Taxes			99.3						104.7
Cost Recovery Riders			39.6						63.2
Asset Retirement Obligations			34.9						33.1
Fuel Adjustment Clause			22.9						56.4
Manufactured Gas Plant			17.7						17.0
PPACA Income Tax Deferral			4.2						4.3
Residential Customer Interim Rate Adjustment			5.9						—
Other			5.6						6.7
Total Non-Current Regulatory Assets			447.1						511.8
Total Regulatory Assets			$485.8						$511.8
Current Regulatory Liabilities (b)
Fuel Adjustment Clause			—						$5.0
Transmission Formula Rates Refund			$5.1						3.1
Other			0.1						0.5
Total Current Regulatory Liabilities			5.2						8.6
Non-Current Regulatory Liabilities
Income Taxes			338.0						353.4
Wholesale and Retail Contra AFUDC			81.5						83.7
Plant Removal Obligations			58.8						52.6
North Dakota Investment Tax Credits			13.4						12.2
Defined Benefit Pension and Other Postretirement Benefit Plans			23.5						28.1
Boswell Units 1 and 2 Net Plant and Equipment			5.1						0.4
Regulated Land Sales			2.2						—
Other			4.9						5.7
Total Non-Current Regulatory Liabilities			527.4						536.1
Total Regulatory Liabilities			$532.6						$544.7

(a)Current regulatory assets are presented within Prepayments and Other on the Consolidated Balance Sheet.

(b)Current regulatory liabilities are presented within Other Current Liabilities on the Consolidated Balance Sheet.

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The entire disclosure for detailed information about regulatory assets and liabilities, including current and noncurrent assets created when regulatory agencies permit the deferral of costs to the balance sheet that would otherwise be required to appear on the company's income statement and would be charged against current expenses or revenues, as well as current and noncurrent liabilities created when regulatory agencies permit.

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