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Environmental Obligations - Narrative (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 USD ($) site operable_unit party | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 1998 USD ($) | Dec. 31, 2021 USD ($)
Environmental Exit Cost [Line Items] |  |  |  |  |
Environmental reserves, excluding recoveries | $ 623.2 | $ 601.8 |  |  |
Environmental loss contingencies, net of expected recoveries, in excess of accrual | 290.0 |  |  |  |
Accrual for environmental loss contingencies | 613.1 | 592.1 | $ 529.2 |  | $ 503.2
Charges to expense for new losses | $ 116.0 | 152.3 | $ 104.8 |  |
Number of operable units evaluated and proposed for CMAs | operable_unit | 6 |  |  |  |
Non-judicial process, parties involved | party | 100 |  |  |  |
Number of sites FMC is named as a potentially responsible party | site | 28 |  |  |  |
Number of sites FMC may be a potentially responsible party or equivalent | site | 45 |  |  |  |
Middleport Litigation |  |  |  |  |
Environmental Exit Cost [Line Items] |  |  |  |  |
Settlement payment | $ 10.0 | 12.5 |  |  |
Pending Litigation | Middleport Litigation |  |  |  |  |
Environmental Exit Cost [Line Items] |  |  |  |  |
Operable units | operable_unit | 11 |  |  |  |
Cash outflow, maximum, after year 2021 | $ 10.0 |  |  |  |
Pocatello |  |  |  |  |
Environmental Exit Cost [Line Items] |  |  |  |  |
Accrual for environmental loss contingencies | 115.9 | 82.9 |  |  |
Charges to expense for new losses | $ 28.0 |  |  |  |
Tribal permit fee |  |  |  | $ 1.5 |
Discount rate | 4.86% |  |  |  |
Estimated year three fees | $ 1.5 |  |  |  |
Expected aggregate undiscounted fees | 75.0 |  |  |  |
Middleport |  |  |  |  |
Environmental Exit Cost [Line Items] |  |  |  |  |
Accrual for environmental loss contingencies | $ 128.5 | $ 130.8 |  |  |

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