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Business Segment Information: Information Relating to Segments Statement of Income (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2025
Sep. 30, 2024
Segment Reporting Information                
Revenue $ 430.2     $ 401.6     $ 1,674.5 $ 1,530.6
Fuel, purchased power and cost of natural gas sold 112.0     94.5     595.7 518.2
Operations and maintenance - Direct 75.7     69.4     225.7 202.3
Operations and maintenance - Allocated 75.1     76.2     226.5 218.5
Depreciation and amortization 71.5     69.3     210.5 201.8
Taxes other than income taxes 17.2     16.4     50.0 50.0
Operating income (loss) 78.7     75.8     366.1 339.8
Interest expense, net (49.4)     (45.2)     (149.6) (131.9)
Other income (expense), net 0.6     (1.3)     1.1 (1.7)
Income tax (expense) (4.0)     (2.9)     (26.5) (23.6)
Net income 25.9 $ 28.8 $ 136.4 26.4 $ 24.7 $ 131.6 191.1 182.6
Net income attributable to non-controlling interest (1.0)     (2.0)     (4.5) (7.6)
Net income available for common stock 24.9     24.4     186.6 175.0
Corporate, Non-Segment                
Segment Reporting Information                
Revenue (3.9)     (4.5)     (11.7) (13.4)
Fuel, purchased power and cost of natural gas sold (0.1)     (0.1)     (0.2) (0.4)
Operations and maintenance - Direct 0.7     (4.3)     (4.1) (12.3)
Depreciation and amortization             (0.1) 0.1
Taxes other than income taxes       0.1        
Operating income (loss) (4.5)     (0.2)     (7.3) (0.8)
Operating Segments | Electric Utilities                
Segment Reporting Information                
Revenue 249.7     232.5     706.3 659.8
Fuel, purchased power and cost of natural gas sold 69.8     54.9     192.2 155.7
Operations and maintenance - Direct 36.1     32.4     107.9 97.1
Operations and maintenance - Allocated 33.7     32.7     99.9 93.4
Depreciation and amortization 38.3     38.0     113.0 108.9
Taxes other than income taxes 9.4     9.4     27.6 28.7
Operating income (loss) 62.4     65.1     165.7 176.0
Operating Segments | Gas Utilities                
Segment Reporting Information                
Revenue 184.4     173.6     979.9 884.2
Fuel, purchased power and cost of natural gas sold 42.3     39.7     403.7 362.9
Operations and maintenance - Direct 38.9     41.3     121.9 117.5
Operations and maintenance - Allocated 41.4     43.5     126.6 125.1
Depreciation and amortization 33.2     31.3     97.6 92.8
Taxes other than income taxes 7.8     6.9     22.4 21.3
Operating income (loss) 20.8     10.9     207.7 164.6
External Customers                
Segment Reporting Information                
Revenue 430.2     401.6     1,674.5 1,530.6
External Customers | Operating Segments | Electric Utilities                
Segment Reporting Information                
Revenue 247.3     229.6     699.1 651.0
External Customers | Operating Segments | Gas Utilities                
Segment Reporting Information                
Revenue 182.9     172.0     975.4 879.6
Inter-segment | Corporate, Non-Segment                
Segment Reporting Information                
Revenue (3.9)     (4.5)     (11.7) (13.4)
Inter-segment | Operating Segments | Electric Utilities                
Segment Reporting Information                
Revenue 2.4     2.9     7.2 8.8
Inter-segment | Operating Segments | Gas Utilities                
Segment Reporting Information                
Revenue $ 1.5     $ 1.6     $ 4.5 $ 4.6