| **Financial Instruments & Related Fair Value (Details) MMBTU in Millions**                                     | 3 Months Ended | 9 Months Ended |                                                                                                                      |
|--------------------------------------------------------------------------------------------------------------------|----------------|----------------|----------------------------------------------------------------------------------------------------------------------|
||
| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]**                   |           |           |                                                                                                                 |   |   |
| Fair value measurement transfers between levels activity                                                           | $ 0            | $ 0            |                                                                                                                 |   |   |
| **Assets, Fair Value Disclosure**                                                                                  |           |           |                                                                                                                 |   |   |
| Debt and equity securities held as trading securities                                                              | 5,412,000      |           | $ 5,412,000                                                                                                          |   | $ 4,902,000 |
| **Fair Value, Derivative Liability Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]** |           |           |                                                                                                                 |   |   |
| Gas supply derivative liabilities, beginning balance                                                               | 164,900,000    |           | 0                                                                                                                    |   |   |
| Realized and unrealized gains (losses) recorded to regulatory assets                                               | 18,000,000     |           | 182,900,000                                                                                                          |   |   |
| Purchases, sales and settlements (net)                                                                             | 0              |           | 0                                                                                                                    |   |   |
| Transfer in/out of Level 3                                                                                         | 0              |           | 0                                                                                                                    |   |   |
| Gas supply derivative liabilities, ending balance                                                                  | 182,900,000    |           | 182,900,000                                                                                                          |   |   |
| **Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]**                               |           |           |                                                                                                                 |   |   |
| Current Assets – Gas purchase derivative assets                                                              | 4,231,000      |           | 4,231,000                                                                                                            |   | 1,343,000 |
| Current Liabilities – Gas supply derivative liabilities                                                      | 33,300,000     |           | 33,300,000                                                                                                           |   | 0 |
| Noncurrent Liabilities – Gas supply derivative liabilities                                                   | 149,600,000    |           | 149,600,000                                                                                                          |   | 0 |
| Long-term debt, carry amount                                                                                       | 1,835,000,000  |           | $ 1,835,000,000                                                                                                      |   | 1,575,000,000 |
| Percentage of annual gas costs approved for recovery under TIP                                                     |           |           | 1.00%                                                                                                                |   |   |
| **Concentration Risk [Line Items]**                                                                                |           |           |                                                                                                                 |   |   |
| Concentration risk, description                                                                                    |           |           | “Trade accounts receivable” in “Current Assets” in the Condensed Consolidated Balance Sheets |   |   |
| Fair Value, Measurements, Recurring                                                                                |           |           |                                                                                                                 |   |   |
| **Assets, Fair Value Disclosure**                                                                                  |           |           |                                                                                                                 |   |   |
| Total fair value assets                                                                                            | 9,643,000      |           | $ 9,643,000                                                                                                          |   | 6,245,000 |
| Money markets | Fair Value, Measurements, Recurring                                                                |           |           |                                                                                                                 |   |   |
| **Assets, Fair Value Disclosure**                                                                                  |           |           |                                                                                                                 |   |   |
| Debt and equity securities held as trading securities                                                              | 605,000        |           | 605,000                                                                                                              |   | 516,000 |
| Mutual funds | Fair Value, Measurements, Recurring                                                                 |           |           |                                                                                                                 |   |   |
| **Assets, Fair Value Disclosure**                                                                                  |           |           |                                                                                                                 |   |   |
| Debt and equity securities held as trading securities                                                              | $ 4,807,000    |           | $ 4,807,000                                                                                                          |   | $ 4,386,000 |
| Gas Purchase Options                                                                                               |           |           |                                                                                                                 |   |   |
| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]**                   |           |           |                                                                                                                 |   |   |
| Long gas purchase options providing total coverage | MMBTU                                                         | 22.2           |           | 22.2                                                                                                                 |   | 34.7 |
| Collateral, Obligation to Return Cash                                                                              | $ 0            |           | $ 0                                                                                                                  |   | $ 0 |
| Collateral, Right to Reclaim Cash                                                                                  | 0              |           | 0                                                                                                                    |   | 0 |
| **Liabilities, Fair Value Disclosure**                                                                             |           |           |                                                                                                                 |   |   |
| Derivative Liability                                                                                               | 0              |           | 0                                                                                                                    |   | 0 |
| **Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]**                               |           |           |                                                                                                                 |   |   |
| Current Assets – Gas purchase derivative assets                                                              | 4,231,000      |           | 4,231,000                                                                                                            |   | 1,343,000 |
| Gas purchase options                                                                                               | (886,000)      | (1,007,000)    | (4,428,000)                                                                                                          | $ (3,296,000) |   |
| Amount Of Gain (Loss) Deferred Under PGA Procedures                                                                | (886,000)      | $ (1,007,000)  | (4,428,000)                                                                                                          | $ (3,296,000) |   |
| Gas Purchase Options | Fair Value, Measurements, Recurring                                                         |           |           |                                                                                                                 |   |   |
| **Assets, Fair Value Disclosure**                                                                                  |           |           |                                                                                                                 |   |   |
| Derivatives - gas purchase options held for utility operations                                                     | 4,231,000      |           | 4,231,000                                                                                                            |   | 1,343,000 |
| Gas Supply Contracts                                                                                               |           |           |                                                                                                                 |   |   |
| **Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]**                               |           |           |                                                                                                                 |   |   |
| Current Liabilities – Gas supply derivative liabilities                                                      | 33,300,000     |           | 33,300,000                                                                                                           |   |   |
| Noncurrent Liabilities – Gas supply derivative liabilities                                                   | 149,600,000    |           | 149,600,000                                                                                                          |   |   |
| Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss)                              | (18,000,000)   |           | $ (182,900,000.0)                                                                                                    |   |   |
| Gas Supply Contracts | Minimum                                                                                     |           |           |                                                                                                                 |   |   |
| **Liabilities, Fair Value Disclosure**                                                                             |           |           |                                                                                                                 |   |   |
| Fair Value Inputs, Price Per Dekatherm | $ / MMBTU                                                                 |           |           | 2.62                                                                                                                 |   |   |
| Gas Supply Contracts | Maximum                                                                                     |           |           |                                                                                                                 |   |   |
| **Liabilities, Fair Value Disclosure**                                                                             |           |           |                                                                                                                 |   |   |
| Fair Value Inputs, Price Per Dekatherm | $ / MMBTU                                                                 |           |           | 4.80                                                                                                                 |   |   |
| Gas Supply Contracts | Fair Value, Measurements, Recurring                                                         |           |           |                                                                                                                 |   |   |
| **Liabilities, Fair Value Disclosure**                                                                             |           |           |                                                                                                                 |   |   |
| Derivative Liability                                                                                               | 182,900,000    |           | $ 182,900,000                                                                                                        |   |   |
| Quoted Prices in Active Markets (Level 1) | Fair Value, Measurements, Recurring                                    |           |           |                                                                                                                 |   |   |
| **Assets, Fair Value Disclosure**                                                                                  |           |           |                                                                                                                 |   |   |
| Total fair value assets                                                                                            | 9,643,000      |           | 9,643,000                                                                                                            |   | 6,245,000 |
| Quoted Prices in Active Markets (Level 1) | Money markets | Fair Value, Measurements, Recurring                    |           |           |                                                                                                                 |   |   |
| **Assets, Fair Value Disclosure**                                                                                  |           |           |                                                                                                                 |   |   |
| Debt and equity securities held as trading securities                                                              | 605,000        |           | 605,000                                                                                                              |   | 516,000 |
| Quoted Prices in Active Markets (Level 1) | Mutual funds | Fair Value, Measurements, Recurring                     |           |           |                                                                                                                 |   |   |
| **Assets, Fair Value Disclosure**                                                                                  |           |           |                                                                                                                 |   |   |
| Debt and equity securities held as trading securities                                                              | 4,807,000      |           | 4,807,000                                                                                                            |   | 4,386,000 |
| Quoted Prices in Active Markets (Level 1) | Gas Purchase Options | Fair Value, Measurements, Recurring             |           |           |                                                                                                                 |   |   |
| **Assets, Fair Value Disclosure**                                                                                  |           |           |                                                                                                                 |   |   |
| Derivatives - gas purchase options held for utility operations                                                     | 4,231,000      |           | 4,231,000                                                                                                            |   | 1,343,000 |
| Significant Other Observable Inputs (Level 2)                                                                      |           |           |                                                                                                                 |   |   |
| **Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]**                               |           |           |                                                                                                                 |   |   |
| Long-term debt, fair value                                                                                         | 2,131,778,000  |           | 2,131,778,000                                                                                                        |   | $ 1,720,586,000 |
| Significant Unobservable Inputs (Level 3) | Gas Supply Contracts | Fair Value, Measurements, Recurring             |           |           |                                                                                                                 |   |   |
| **Liabilities, Fair Value Disclosure**                                                                             |           |           |                                                                                                                 |   |   |
| Derivative Liability                                                                                               | 182,900,000    |           | 182,900,000                                                                                                          |   |   |
| Accounts Receivable                                                                                                |           |           |                                                                                                                 |   |   |
| **Concentration Risk [Line Items]**                                                                                |           |           |                                                                                                                 |   |   |
| Concentration risk amount                                                                                          | $ 9,200,000    |           | $ 9,200,000                                                                                                          |   |   |
| Accounts Receivable | Credit Concentration Risk                                                                    |           |           |                                                                                                                 |   |   |
| **Concentration Risk [Line Items]**                                                                                |           |           |                                                                                                                 |   |   |
| Concentration risk, percentage                                                                                     | 15.00%         |           |                                                                                                                 |   |   |

| X                                                                                                                                                                                                                                                                                                                                                                                       |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of gain or loss for gas purchase options recognized on derivatives not designated as hedging instruments, and deferred under PGA loss procedures.
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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration amount (numerator) derived from the division.
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| X                                                                                                                                                                                                                                                                                                                |
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Cost of natural gas stated as a price per dekatherm, used as an input to measure fair value.
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Transfers into and out of fair value hierarchy levels for assets or liabilities measured at fair value.
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| - Definition
Amount of gain (loss) recorded to regulatory assets for financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.
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No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                           |
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| - Definition
The amount of gas purchase options used to provide protection against significant natural gas price increases. We purchase natural gas for our regulated operations for resale under tariffs approved by state regulatory commissions.
+ References
No definition available.
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| - Definition
Percentage of total gas costs approved for recovery under terms and conditions of Tennessee Incentive Plan (TIP) approved by the TRA
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No definition available.
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| - Definition
Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Identifies or describes the benchmark that serves as the denominator in the calculation of the percentage of concentration risk.
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.
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| - Definition
Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.
+ References
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| - Definition
Amount of obligation to return cash collateral under master netting arrangements offset against derivative assets.
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments.
+ References
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.
+ References
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| - Definition
Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.
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| - Definition
Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled after one year or the normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.
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| - Definition
Amount of right to receive cash collateral under master netting arrangements offset against derivative liabilities.
+ References
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| - Definition
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.
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No definition available.
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| - Definition
Amount of unrealized (holding) gain (loss) which is included in the statement of income (or changes in net assets) related to those liabilities still held at the reporting date for which fair value is measured on a recurring basis using significant unobservable inputs (Level 3).
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| - Definition
A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.
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No definition available.
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| - Definition
Amount of purchases, (sales), issuances and (settlements) of financial instrument classified as a derivative asset (liability) after deduction of derivative liability (asset), measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.
+ References
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| - Definition
Amount of transfers of financial instrument classified as a derivative asset (liability) after deduction of derivative liability (asset) into (out of) level 3 of the fair value hierarchy.
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| - Definition
Fair value of financial instrument classified as derivative asset (liability) after deduction of derivative liability (asset), measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.
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| - Definition
Total debt and equity financial instruments including: (1) securities held-to-maturity, (2) trading securities, and (3) securities available-for-sale.
+ References
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| - Definition
Fair value portion of notes payable.
+ References
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