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Business Segment Information | 12 Months Ended
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Dec. 31, 2023
Segment Reporting Information, Additional Information [Abstract] |
Business Segment Information | (16) BUSINESS SEGMENT INFORMATION Our Chief Executive Officer, who is considered to be our CODM, reviews financial information presented on an operating segment basis for purposes of making decisions, allocating resources and assessing financial performance. Our operating segments are based on our method of internal reporting, which is generally segregated by differences in products and services. All of our operations and assets are located within the United States. Our Electric Utilities segment includes the operating results of the regulated electric utility operations of Colorado Electric, South Dakota Electric, and Wyoming Electric, which supply regulated electric utility services to areas in Colorado, Montana, South Dakota and Wyoming. We also own and operate non-regulated power generation and mining businesses that are vertically integrated with our Electric Utilities. Our Gas Utilities segment consists of the operating results of our regulated natural gas utility subsidiaries in Arkansas, Colorado, Iowa, Kansas, Nebraska and Wyoming. Corporate and Other represents certain unallocated expenses for administrative activities that support our operating segments. Corporate and Other also includes business development activities that are not part of our operating segments and inter-segment eliminations. Our CODM assesses the performance of our operating segments based on operating income. Our CODM reviews capital expenditures by operating segment rather than any individual or total asset amount. Our operating segments are equivalent to our reportable segments. 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 |
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.

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- Definition The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 22 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-22 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 15 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-15 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 31 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-31 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 32 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-32 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 42 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-42 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 32 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-32 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 40 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-40 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//280/tableOfContent Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 26 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-26 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 34 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-34 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 41 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-41 Reference 12: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 21 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-21 Reference 13: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 21 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-21 Reference 14: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 32 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-32 + Details
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