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Asset Retirement Obligation (Details) $ in Millions | 6 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2025 USD ($) | Jun. 30, 2024 USD ($) | Sep. 30, 2024 USD ($) | Dec. 31, 2024 USD ($) | Mar. 07, 2024 USD ($) | Dec. 31, 2023 USD ($) | Jul. 27, 2018 USD ($)
ARO Loss Contingencies [Line Items] |  |  |  |  |  |  |
Asset Retirement Obligation, Liabilities Incurred | $ 11.1 |  | $ 29.8 |  |  |  |
Number Of Consent Decrees | 2 |  |  |  |  |  |
Asset Retirement Obligation | $ 2,588.1 |  |  | $ 2,572.2 |  | $ 2,213.4 |
Surety Bonds Outstanding Delivered To EPA |  |  |  |  | $ 327.1 |  |
Asset retirement obligations | $ 2,282.0 |  |  | 2,219.4 |  |  |
Number Of Decades Remaining For Trust | 3 |  |  |  |  |  |
Asset Retirement Obligation, Liabilities Settled | $ (154.8) |  | (253.8) |  |  |  |
Accretion expense for asset retirement obligations | 64.8 | $ 54.1 | 111.2 |  |  |  |
Asset Retirement Obligation, Revision of Estimate | 55.6 |  | 541.4 |  |  |  |
Asset Retirement Obligation, Foreign Currency Translation Gain (Loss) | 39.2 |  | $ (69.8) |  |  |  |
Asset retirement obligations | 306.1 |  |  | 352.8 |  |  |
Unfavorable Regulatory Action | 2015 Consent Decrees With EPA |  |  |  |  |  |  |
ARO Loss Contingencies [Line Items] |  |  |  |  |  |  |
Asset retirement obligations, undiscounted |  |  |  | 2,300.0 |  |  |
Asset Retirement Obligation |  |  |  | 1,100.0 |  |  |
Bonnie Facility Trust [Member] |  |  |  |  |  |  |
ARO Loss Contingencies [Line Items] |  |  |  |  |  |  |
Assets Held-in-trust, Current |  |  |  |  |  |  | $ 21.0
Plant City and Bonnie Facilities |  |  |  |  |  |  |
ARO Loss Contingencies [Line Items] |  |  |  |  |  |  |
Asset retirement obligations | $ 365.6 |  |  | $ 368.7 |  |  |

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- Definition The face amount of surety bonds provided by the entity as of the balance sheet date, which were issued to provide assurance to EPA in connection with mining reclamation obligations. + References No definition available. + Details
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- Definition Undiscounted amount of the accrual for environmental loss contingencies. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 450 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147483076/450-20-50-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 450 -SubTopic 20 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 5.Y.Q1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480102/450-20-S99-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 410 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481931/410-30-50-7 + Details
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- Definition The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Section 25 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481999/410-20-25-4 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481850/410-20-50-1 + Details
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- Definition Amount of accretion expense recognized during the period that is associated with an asset retirement obligation. Accretion expense measures and incorporates changes due to the passage of time into the carrying amount of the liability. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481879/410-20-45-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481850/410-20-50-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 22 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147476148/220-40-50-22 + Details
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- Definition Current portion of the carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481850/410-20-50-1 + Details
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- Definition Amount of foreign currency translation gain (loss) which decreases (increases) asset retirement obligations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481850/410-20-50-1 + Details
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