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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

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