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Environmental Obligations - Narrative (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 USD ($) site operable_unit party | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 1998 USD ($) | Dec. 31, 2020 USD ($)
Environmental Exit Cost [Line Items] |  |  |  |  |
Environmental reserves, excluding recoveries | $ 601.8 | $ 543.1 |  |  |
Environmental loss contingencies, net of expected recoveries, in excess of accrual | 240.0 |  |  |  |
Charges to expense for new losses | 152.3 | 104.8 | $ 65.8 |  |
Accrual for environmental loss contingencies | 592.1 | 529.2 | 503.2 |  | $ 564.4
Payments for attorney fees and unpaid permit fees | $ 92.6 | 74.5 | $ 121.8 |  |
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 | 46 |  |  |  |
Middleport Litigation |  |  |  |  |
Environmental Exit Cost [Line Items] |  |  |  |  |
Settlement payment | $ 12.5 | 11.7 |  |  |
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] |  |  |  |  |
Charges to expense for new losses | 31.1 |  |  |  |
Accrual for environmental loss contingencies | $ 82.9 | 75.8 |  |  |
Tribal permit fee |  |  |  | $ 1.5 |
Discount rate | 4.20% |  |  |  |
Estimated year three fees | $ 1.5 |  |  |  |
Expected aggregate undiscounted fees | 75.0 |  |  |  |
Middleport |  |  |  |  |
Environmental Exit Cost [Line Items] |  |  |  |  |
Accrual for environmental loss contingencies | $ 130.8 | $ 108.2 |  |  |

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