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Business Segment Information (Tables) | 12 Months Ended
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Dec. 31, 2023
Segment Reporting Information, Additional Information [Abstract] |
Segment information included in Consolidated Balance Sheets |
Capital Expenditures (a) for the years ended December 31, | 2023 |  | 2022 |  | 2021 |
Electric Utilities | $ | 210.7 |  | $ | 243.1 |  | $ | 285.8 |
Gas Utilities |  | 371.9 |  |  | 349.5 |  |  | 383.3 |
Corporate and Other |  | 7.3 |  |  | 5.1 |  |  | 10.5 |
Total capital expenditures | $ | 589.9 |  | $ | 597.7 |  | $ | 679.6 |
(a) Includes accruals for property, plant and equipment as disclosed in the Supplemental Cash Flow Information to the Consolidated Statement of Cash Flows.
Segment information included in Consolidated Statements of Income | Segment information was as follows (in millions):
| Consolidating Income Statement |
Year ended December 31, 2023 | Electric Utilities |  | Gas Utilities |  | Corporate and Other |  | Total |
Revenue - |  |  |  |  |  |  |  |
External Customers | $ | 853.6 |  | $ | 1,477.7 |  | $ | — |  | $ | 2,331.3 |
Inter-segment |  | 11.4 |  |  | 6.5 |  |  | (17.9 | ) |  | — |
Total revenue |  | 865.0 |  |  | 1,484.2 |  |  | (17.9 | ) |  | 2,331.3 |
Fuel, purchased power and cost of natural gas sold |  | 200.1 |  |  | 783.2 |  |  | (0.4 | ) |  | 982.9 |
Operations and maintenance |  | 236.2 |  |  | 328.7 |  |  | (12.9 | ) |  | 552.0 |
Depreciation, depletion and amortization |  | 142.6 |  |  | 113.9 |  |  | 0.3 |  |  | 256.8 |
Taxes - property and production |  | 37.3 |  |  | 29.6 |  |  | — |  |  | 66.9 |
Operating income (loss) | $ | 248.8 |  | $ | 228.8 |  | $ | (4.9 | ) | $ | 472.7 |
Interest expense, net |  |  |  |  |  |  |  | (167.9 | )
Other income (expense), net |  |  |  |  |  |  |  | (3.2 | )
Income tax (expense) |  |  |  |  |  |  |  | (25.6 | )
Net income |  |  |  |  |  |  |  | 276.0 |
Net income attributable to non-controlling interest |  |  |  |  |  |  |  | (13.8 | )
Net income available for common stock |  |  |  |  |  |  | $ | 262.2 |
| Consolidating Income Statement |
Year ended December 31, 2022 | Electric Utilities |  | Gas Utilities |  | Corporate and Other |  | Total |
Revenue - |  |  |  |  |  |  |  |
External Customers | $ | 888.4 |  | $ | 1,663.4 |  | $ | — |  | $ | 2,551.8 |
Inter-segment |  | 11.8 |  |  | 5.7 |  |  | (17.5 | ) |  | — |
Total revenue |  | 900.2 |  |  | 1,669.1 |  |  | (17.5 | ) |  | 2,551.8 |
Fuel, purchased power and cost of natural gas sold |  | 266.3 |  |  | 965.1 |  |  | (0.8 | ) |  | 1,230.6 |
Operations and maintenance |  | 244.8 |  |  | 317.3 |  |  | (13.7 | ) |  | 548.4 |
Depreciation, depletion and amortization |  | 135.9 |  |  | 114.7 |  |  | 0.3 |  |  | 250.9 |
Taxes - property and production |  | 38.9 |  |  | 27.8 |  |  | — |  |  | 66.7 |
Operating income (loss) | $ | 214.3 |  | $ | 244.2 |  | $ | (3.3 | ) | $ | 455.2 |
Interest expense, net |  |  |  |  |  |  |  | (161.0 | )
Other income (expense), net |  |  |  |  |  |  |  | 1.8 |
Income tax (expense) |  |  |  |  |  |  |  | (25.2 | )
Net income |  |  |  |  |  |  |  | 270.8 |
Net income attributable to non-controlling interest |  |  |  |  |  |  |  | (12.4 | )
Net income available for common stock |  |  |  |  |  |  | $ | 258.4 |
| Consolidating Income Statement |
Year ended December 31, 2021 | Electric Utilities |  | Gas Utilities |  | Corporate and Other |  | Total |
Revenue - |  |  |  |  |  |  |  |
External Customers | $ | 830.7 |  | $ | 1,118.4 |  | $ | — |  | $ | 1,949.1 |
Inter-segment |  | 11.5 |  |  | 6.5 |  |  | (18.0 | ) |  | — |
Total revenue |  | 842.2 |  |  | 1,124.9 |  |  | (18.0 | ) |  | 1,949.1 |
Fuel, purchased power and cost of natural gas sold |  | 248.0 |  |  | 494.7 |  |  | (0.8 | ) |  | 741.9 |
Operations and maintenance |  | 224.5 |  |  | 290.2 |  |  | (13.0 | ) |  | 501.7 |
Depreciation, depletion and amortization |  | 131.5 |  |  | 104.2 |  |  | 0.3 |  |  | 236.0 |
Taxes - property and production |  | 35.5 |  |  | 24.6 |  |  | — |  |  | 60.1 |
Operating income (loss) | $ | 202.7 |  | $ | 211.2 |  | $ | (4.5 | ) | $ | 409.4 |
Interest expense, net |  |  |  |  |  |  |  | (152.4 | )
Other income (expense), net |  |  |  |  |  |  |  | 1.4 |
Income tax (expense) |  |  |  |  |  |  |  | (7.2 | )
Net income |  |  |  |  |  |  |  | 251.2 |
Net income attributable to non-controlling interest |  |  |  |  |  |  |  | (14.5 | )
Net income available for common stock |  |  |  |  |  |  | $ | 236.7 |

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