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Fair Value Measurements (Tables) | 9 Months Ended
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Sep. 30, 2025
Fair Value Disclosures [Abstract] |
Schedule of Fair Value Hierarchy, Measured on Recurring Basis | The following tables set forth, by level within the fair value hierarchy, our gross assets and gross liabilities and related offsetting as permitted by GAAP that were accounted for at fair value on a recurring basis for derivative instruments.
| As of September 30, 2025 |
| Level 1 |  | Level 2 |  | Level 3 |  | Cash Collateral and Counterparty Netting (a) |  | Total |
| (in millions) |
Assets: |  |  |  |  |  |  |  |  |  |
Commodity derivatives - Gas Utilities | $ | — |  | $ | 5.2 |  | $ | — |  | $ | (5.2 | ) | $ | — |
Total | $ | — |  | $ | 5.2 |  | $ | — |  | $ | (5.2 | ) | $ | — |
Liabilities: |  |  |  |  |  |  |  |  |  |
Commodity derivatives - Gas Utilities | $ | — |  | $ | 8.0 |  | $ | — |  | $ | (2.8 | ) | $ | 5.2 |
Total | $ | — |  | $ | 8.0 |  | $ | — |  | $ | (2.8 | ) | $ | 5.2 |
(a) As of September 30, 2025, $5.2 million of our commodity derivative assets and $2.8 million of our commodity derivative liabilities, as well as related gross collateral amounts, were subject to master netting agreements.
| As of December 31, 2024 |
| Level 1 |  | Level 2 |  | Level 3 |  | Cash Collateral and Counterparty Netting (a) |  | Total |
| (in millions) |
Assets: |  |  |  |  |  |  |  |  |  |
Commodity derivatives - Gas Utilities | $ | — |  | $ | 2.2 |  | $ | — |  | $ | (2.2 | ) | $ | — |
Total | $ | — |  | $ | 2.2 |  | $ | — |  | $ | (2.2 | ) | $ | — |
Liabilities: |  |  |  |  |  |  |  |  |  |
Commodity derivatives - Gas Utilities | $ | — |  | $ | 4.8 |  | $ | — |  | $ | (0.6 | ) | $ | 4.2 |
Total | $ | — |  | $ | 4.8 |  | $ | — |  | $ | (0.6 | ) | $ | 4.2 |
(a) As of December 31, 2024, $2.2 million of our commodity derivative assets and $0.6 million of our commodity derivative liabilities, as well as related gross collateral amounts, were subject to master netting agreements.
Fair Value, by Balance Sheet Grouping | The following table presents the carrying amounts and fair values of financial instruments not recorded at fair value on the Consolidated Balance Sheets as of:
| September 30, 2025 |  | December 31, 2024 |
| Carrying Amount |  | Fair Value |  | Carrying Amount |  | Fair Value |
| (in millions) |
Long-term debt, including current maturities (a) | $ | 4,252.8 |  | $ | 4,180.9 |  | $ | 4,250.2 |  | $ | 4,059.1 |
(a) Long-term debt is valued based on observable inputs available either directly or indirectly for similar liabilities in active markets and therefore is classified in Level 2 in the fair value hierarchy. Carrying amount of long-term debt is net of deferred financing costs.

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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name Accounting Standards Codification -Section 55 -Paragraph 10 -SubTopic 10 -Topic 825 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482881/825-10-55-10 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-13 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482881/825-10-55-12 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-12 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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