Derivative Instruments and Hedging Activities - Schedule of Outstanding Hedge Forecast (Details)	Mar. 31, 2026 $ / gal $ / barrel $ / dekatherm $ / MWh
Natural Gas, December 2033 \| Natural gas purchases
Derivative [Line Items]
Average floor price \| $ / dekatherm	2.79
Average cap price \| $ / dekatherm	6.51
Tar Oil, December 2027 \| Tar oil sales
Derivative [Line Items]
Average floor price \| $ / barrel	52.00
Average cap price \| $ / barrel	93.80
Electricity, December 2027 \| Electricity purchases
Derivative [Line Items]
Average floor price \| $ / MWh	30.50
Average cap price \| $ / MWh	58.60
Diesel, January 2029 \| Diesel purchases
Derivative [Line Items]
Average floor price \| $ / gal	2.05
Average cap price \| $ / gal	2.44
Minimum \| Natural Gas, December 2033 \| Natural gas purchases
Derivative [Line Items]
Contracted Monthly Volumes of Forecasted Transactions	20.00%
Minimum \| Tar Oil, December 2027 \| Tar oil sales
Derivative [Line Items]
Contracted Monthly Volumes of Forecasted Transactions	23.00%
Minimum \| Electricity, December 2027 \| Electricity purchases
Derivative [Line Items]
Contracted Monthly Volumes of Forecasted Transactions	24.00%
Minimum \| Diesel, January 2029 \| Diesel purchases
Derivative [Line Items]
Contracted Monthly Volumes of Forecasted Transactions	9.00%
Maximum \| Natural Gas, December 2033 \| Natural gas purchases
Derivative [Line Items]
Contracted Monthly Volumes of Forecasted Transactions	62.00%
Maximum \| Tar Oil, December 2027 \| Tar oil sales
Derivative [Line Items]
Contracted Monthly Volumes of Forecasted Transactions	90.00%
Maximum \| Electricity, December 2027 \| Electricity purchases
Derivative [Line Items]
Contracted Monthly Volumes of Forecasted Transactions	90.00%
Maximum \| Diesel, January 2029 \| Diesel purchases
Derivative [Line Items]
Contracted Monthly Volumes of Forecasted Transactions	80.00%

The average cap rate on a group of price risk derivatives such as caps or collars. A payment or receipt is triggered if the market rate exceeds the cap rate on the contract.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-5

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The average floor rate on a group of price risk derivatives such as floors or collars. A payment or receipt is triggered if the market rate falls below the floor rate on the contract.

+ 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.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 5A
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-5A

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 18
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-18

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 815
-SubTopic 20
-Name Accounting Standards Codification
-Section 25
-Paragraph 6A
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480682/815-20-25-6A

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The percentage of expected requirements covered by the aggregate notional amount of derivative contracts expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract as a percentage of expected need.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-5

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