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Business Segment Information: Information Relating to Segments Statement of Income (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Segment Reporting Information      
Revenue from contracts with customers $ 2,301.7 $ 2,542.9 $ 1,930.9
Revenue 2,331.3 2,551.8 1,949.1
Fuel, purchased power and cost of natural gas sold 982.9 1,230.6 741.9
Operations and maintenance 552.0 548.4 501.7
Depreciation, depletion and amortization 256.8 250.9 236.0
Taxes - property and production 66.9 66.7 60.1
Operating income (loss) 472.7 455.2 409.4
Interest expense, net (167.9) (161.0) (152.4)
Other income (expense), net (3.2) 1.8 1.4
Income tax (expense) (25.6) (25.2) (7.2)
Net income 276.0 270.8 251.2
Net income attributable to non-controlling interest (13.8) (12.4) (14.5)
Net income available for common stock 262.2 258.4 236.7
Corporate, Non-Segment      
Segment Reporting Information      
Revenue (17.9) (17.5) (18.0)
Fuel, purchased power and cost of natural gas sold (0.4) (0.8) (0.8)
Operations and maintenance (12.9) (13.7) (13.0)
Depreciation, depletion and amortization 0.3 0.3 0.3
Taxes - property and production    
Operating income (loss) (4.9) (3.3) (4.5)
Inter-segment Eliminations      
Segment Reporting Information      
Revenue from contracts with customers (17.9) (17.0) (17.6)
Revenue (17.9) (17.5) (18.0)
Operating Segments | Electric Utilities      
Segment Reporting Information      
Revenue from contracts with customers 854.2 894.6 836.9
Revenue 865.0 900.2 842.2
Fuel, purchased power and cost of natural gas sold 200.1 266.3 248.0
Operations and maintenance 236.2 244.8 224.5
Depreciation, depletion and amortization 142.6 135.9 131.5
Taxes - property and production 37.3 38.9 35.5
Operating income (loss) 248.8 214.3 202.7
Operating Segments | Gas Utilities      
Segment Reporting Information      
Revenue from contracts with customers 1,465.4 1,665.3 1,111.6
Revenue 1,484.2 1,669.1 1,124.9
Fuel, purchased power and cost of natural gas sold 783.2 965.1 494.7
Operations and maintenance 328.7 317.3 290.2
Depreciation, depletion and amortization 113.9 114.7 104.2
Taxes - property and production 29.6 27.8 24.6
Operating income (loss) 228.8 244.2 211.2
Other revenues      
Segment Reporting Information      
Revenue 29.6 8.9 18.2
Other revenues | Inter-segment Eliminations      
Segment Reporting Information      
Revenue 0.0 (0.5) (0.4)
Other revenues | Operating Segments | Electric Utilities      
Segment Reporting Information      
Revenue 10.8 5.6 5.3
Other revenues | Operating Segments | Gas Utilities      
Segment Reporting Information      
Revenue 18.8 3.8 13.3
External Customers      
Segment Reporting Information      
Revenue 2,331.3 2,551.8 1,949.1
External Customers | Operating Segments | Electric Utilities      
Segment Reporting Information      
Revenue 853.6 888.4 830.7
External Customers | Operating Segments | Gas Utilities      
Segment Reporting Information      
Revenue 1,477.7 1,663.4 1,118.4
Intercompany Customers | Corporate, Non-Segment      
Segment Reporting Information      
Revenue (17.9) (17.5) (18.0)
Intercompany Customers | Operating Segments | Electric Utilities      
Segment Reporting Information      
Revenue 11.4 11.8 11.5
Intercompany Customers | Operating Segments | Gas Utilities      
Segment Reporting Information      
Revenue $ 6.5 $ 5.7 $ 6.5