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Regulatory Matters (Tables)
 6 Months Ended
Jun. 30, 2022
Regulated Operations [Abstract]  
Regulatory Assets and Liabilities [Table Text Block]
Regulatory Assets and LiabilitiesJune 30,
2022		December 31,
2021
Millions 
Current Regulatory Assets (a)
  
Fuel Adjustment Clause $39.8 — 
Total Current Regulatory Assets39.8 — 
Non-Current Regulatory Assets  
Defined Benefit Pension and Other Postretirement Benefit Plans220.1 $226.4 
Income Taxes100.7 104.7 
Cost Recovery Riders49.9 63.2 
Asset Retirement Obligations 34.2 33.1 
Fuel Adjustment Clause 34.7 56.4 
Manufactured Gas Plant
17.6 17.0 
PPACA Income Tax Deferral4.2 4.3 
Residential Customer Interim Rate Adjustment3.8 — 
Other5.7 6.7 
Total Non-Current Regulatory Assets470.9 511.8 
Total Regulatory Assets$510.7 $511.8 
Current Regulatory Liabilities (b)
  
Fuel Adjustment Clause— $5.0 
Transmission Formula Rates Refund$4.5 3.1 
Other1.1 0.5 
Total Current Regulatory Liabilities 5.6 8.6 
Non-Current Regulatory Liabilities  
Income Taxes 341.7 353.4 
Wholesale and Retail Contra AFUDC 82.2 83.7 
Plant Removal Obligations56.9 52.6 
North Dakota Investment Tax Credits 13.6 12.2 
Defined Benefit Pension and Other Postretirement Benefit Plans25.0 28.1 
Boswell Units 1 and 2 Net Plant and Equipment2.8 0.4 
Other10.4 5.7 
Total Non-Current Regulatory Liabilities532.6 536.1 
Total Regulatory Liabilities$538.2 $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.