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Regulatory Matters (Tables)

3 Months Ended

Mar. 31, 2021

Regulated Operations [Abstract]

Regulatory Assets and Liabilities [Table Text Block]

Regulatory Assets and Liabilities			March 31, 2021						December 31, 2020
Millions
Non-Current Regulatory Assets
Defined Benefit Pension and Other Postretirement Benefit Plans			$255.3						$259.7
Income Taxes			110.7						113.7
Cost Recovery Riders			57.5						54.0
Asset Retirement Obligations			31.5						31.6
Manufactured Gas Plant			5.8						8.8
Boswell Units 1 and 2 Net Plant and Equipment			3.6						5.0
PPACA Income Tax Deferral			4.5						4.5
Other			3.8						3.6
Total Non-Current Regulatory Assets			$472.7						$480.9
Current Regulatory Liabilities (a)
Fuel Adjustment Clause			$1.8						$3.7
Transmission Formula Rates Refund			2.4						2.9
Other			0.4						1.0
Total Current Regulatory Liabilities			4.6						7.6
Non-Current Regulatory Liabilities
Income Taxes			367.8						375.3
Wholesale and Retail Contra AFUDC			85.9						86.6
Plant Removal Obligations			43.0						41.2
Defined Benefit Pension and Other Postretirement Benefit Plans			3.4						4.4
North Dakota Investment Tax Credits			12.4						12.0
Conservation Improvement Program			1.7						1.5
Other			3.7						3.8
Total Non-Current Regulatory Liabilities			517.9						524.8
Total Regulatory Liabilities			$522.5						$532.4

(a)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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