XML 40 R29.htm IDEA: XBRL DOCUMENT
v3.26.1

EARNINGS PER SHARE (Tables) | 6 Months Ended
--- | ---
Jun. 30, 2026
EARNINGS PER SHARE [Line Items] |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] | The following tables set forth the computation of basic and diluted EPS from continuing operations for the periods indicated:
| Three Months Ended June 30, 2026
| Income |  | Shares |  | Per Share Amount
| (Thousands, except per share amounts)
Basic EPS Calculation |  |  |  |  |
Net income available for common stock | $ | 46,808 |  |  | 62,959 |  |  | $ | 0.74 |
Diluted EPS Calculation |  |  |  |  |
Effect of dilutive securities | — |  |  | 194 |  |  |
Net income available for common stock and common stock equivalents | $ | 46,808 |  |  | 63,153 |  |  | $ | 0.74 |
| Three Months Ended June 30, 2025
| Income |  | Shares |  | Per Share Amount
| (Thousands, except per share amounts)
Basic EPS Calculation |  |  |  |  |
Net income available for common stock | $ | 32,033 |  |  | 60,113 |  |  | $ | 0.53 |
Diluted EPS Calculation |  |  |  |  |
Effect of dilutive securities | — |  |  | 342 |  |  |
Net income available for common stock and common stock equivalents | $ | 32,033 |  |  | 60,455 |  |  | $ | 0.53 |
| Six Months Ended June 30, 2026
| Income |  | Shares |  | Per Share Amount
| (Thousands, except per share amounts)
Basic EPS Calculation |  |  |  |  |
Net income available for common stock | $ | 175,481 |  |  | 62,936 |  |  | $ | 2.79 |
Diluted EPS Calculation |  |  |  |  |
Effect of dilutive securities | — |  |  | 242 |  |  |
Net income available for common stock and common stock equivalents | $ | 175,481 |  |  | 63,178 |  |  | $ | 2.78 |
| Six Months Ended June 30, 2025
| Income |  | Shares |  | Per Share Amount
| (Thousands, except per share amounts)
Basic EPS Calculation |  |  |  |  |
Net income available for common stock | $ | 151,452 |  |  | 60,095 |  |  | 2.52
Diluted EPS Calculation |  |  |  |  |
Effect of dilutive securities | — |  |  | 266 |  |  |
Net income available for common stock and common stock equivalents | $ | 151,452 |  |  | 60,361 |  |  | $ | 2.51 |

X
- Definition [Line Items] for Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References No definition available. + Details
Name: | ogs_EARNINGSPERSHAREOFCOMMONSTOCKBASICANDDILUTEDLineItems
Namespace Prefix: | ogs_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482662/260-10-50-1 + Details
Name: | us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration