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Business Segment Information: Information Relating to Segments Statement of Income (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Segment Reporting Information      
Revenue $ 2,127.7 $ 2,331.3 $ 2,551.8
Fuel, purchased power and cost of natural gas sold 730.3 982.9 1,230.6
Operations and maintenance - Direct 266.6 261.5 268.8
Operations and maintenance - Allocated 290.4 290.5 279.6
Depreciation, depletion and amortization 270.1 256.8 250.9
Taxes other than income taxes 67.2 66.9 66.7
Operating income (loss) 503.1 472.7 455.2
Interest expense, net (181.7) (167.9) (161.0)
Other income (expense), net (1.4) (3.2) 1.8
Income tax (expense) (36.3) (25.6) (25.2)
Net income 283.7 276.0 270.8
Net income attributable to non-controlling interest (10.6) (13.8) (12.4)
Net income available for common stock 273.1 262.2 258.4
Corporate, Non-Segment      
Segment Reporting Information      
Revenue (17.8) (17.9) (17.5)
Fuel, purchased power and cost of natural gas sold (0.4) (0.4) (0.8)
Operations and maintenance - Direct (16.3) (12.9) (13.7)
Depreciation, depletion and amortization 0.1 0.3 0.3
Taxes other than income taxes    
Operating income (loss) (1.2) (4.9) (3.3)
Operating Segments | Electric Utilities      
Segment Reporting Information      
Revenue 876.1 865.0 900.2
Fuel, purchased power and cost of natural gas sold 206.4 200.1 266.3
Operations and maintenance - Direct 127.5 112.2 124.0
Operations and maintenance - Allocated 125.1 124.0 120.8
Depreciation, depletion and amortization 145.3 142.6 135.9
Taxes other than income taxes 38.8 37.3 38.9
Operating income (loss) 233.0 248.8 214.3
Operating Segments | Gas Utilities      
Segment Reporting Information      
Revenue 1,269.4 1,484.2 1,669.1
Fuel, purchased power and cost of natural gas sold 524.3 783.2 965.1
Operations and maintenance - Direct 155.4 162.2 158.5
Operations and maintenance - Allocated 165.3 166.5 158.8
Depreciation, depletion and amortization 124.7 113.9 114.7
Taxes other than income taxes 28.4 29.6 27.8
Operating income (loss) 271.3 228.8 244.2
External Customers      
Segment Reporting Information      
Revenue 2,127.7 2,331.3 2,551.8
External Customers | Operating Segments | Electric Utilities      
Segment Reporting Information      
Revenue 864.4 853.6 888.4
External Customers | Operating Segments | Gas Utilities      
Segment Reporting Information      
Revenue 1,263.3 1,477.7 1,663.4
Inter-segment | Corporate, Non-Segment      
Segment Reporting Information      
Revenue (17.8) (17.9) (17.5)
Inter-segment | Operating Segments | Electric Utilities      
Segment Reporting Information      
Revenue 11.7 11.4 11.8
Inter-segment | Operating Segments | Gas Utilities      
Segment Reporting Information      
Revenue $ 6.1 $ 6.5 $ 5.7