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Environmental Obligations - Narrative (Details) $ in Millions |  |  |  | 2 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Nov. 15, 2019 USD ($) | Sep. 28, 2017 USD ($) | Apr. 25, 2006 USD ($) | Feb. 25, 2021 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) operable_unit site party | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 1998 USD ($) | Dec. 31, 2017 USD ($)
Environmental Exit Cost [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Environmental reserves, excluding recoveries |  |  |  |  | $ 595.8 |  |  | $ 574.7 | $ 595.8 |  |  |
Environmental loss contingencies, net of expected recoveries, in excess of accrual |  |  |  |  |  |  |  | 170.0 |  |  |  |
Accrual for environmental loss contingencies |  |  |  |  | 585.8 | $ 521.5 |  | 564.4 | 585.8 | $ 521.5 |  | $ 411.8
Charges to expense for new losses |  |  |  |  |  |  |  | 53.2 | 138.8 | 178.2 |  |
Payments for attorney fees and unpaid permit fees |  |  |  |  |  |  |  | $ 81.1 | 73.8 | 65.7 |  |
Number of operable units evaluated and proposed for CMAs | operable_unit |  |  |  |  |  |  |  | 6 |  |  |  |
Number of sites FMC is named as a potentially responsible party | site |  |  |  |  |  |  |  | 29 |  |  |  |
Number of sites FMC may be a potentially responsible party or equivalent | site |  |  |  |  |  |  |  | 47 |  |  |  |
Non-judicial process, parties involved | party |  |  |  |  |  |  |  | 70 |  |  |  |
Middleport Litigation |  |  |  |  |  |  |  |  |  |  |  |
Environmental Exit Cost [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Settlement payment |  |  |  |  |  |  |  | $ 17.9 | 22.2 |  |  |
Pending Litigation | Middleport Litigation |  |  |  |  |  |  |  |  |  |  |  |
Environmental Exit Cost [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Accrual for environmental loss contingencies |  |  |  |  |  | 29.1 |  |  |  | 29.1 |  |
Charges to expense for new losses |  |  |  |  |  | 106.3 |  |  |  |  |  |
Operable units | operable_unit |  |  |  |  |  |  |  | 11 |  |  |  |
Cash outflow, maximum, after year 2021 |  |  |  |  |  |  |  | $ 10.0 |  |  |  |
Minimum | Pending Litigation | Middleport Litigation |  |  |  |  |  |  |  |  |  |  |  |
Environmental Exit Cost [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cash outflow in 2020 |  |  |  |  |  |  |  | 20.0 |  |  |  |
Cash outflow in 2020 |  |  |  |  |  |  |  | 20.0 |  |  |  |
Maximum | Pending Litigation | Middleport Litigation |  |  |  |  |  |  |  |  |  |  |  |
Environmental Exit Cost [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cash outflow in 2020 |  |  |  |  |  |  |  | 30.0 |  |  |  |
Cash outflow in 2020 |  |  |  |  |  |  |  | 30.0 |  |  |  |
Environmental Remediation Costs | Pending Litigation | Middleport Litigation |  |  |  |  |  |  |  |  |  |  |  |
Environmental Exit Cost [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Charges to expense for new losses |  |  |  |  |  | 60.6 |  |  |  |  |  |
Implementation and Completion of Selected Remedy | Pending Litigation | Middleport Litigation |  |  |  |  |  |  |  |  |  |  |  |
Environmental Exit Cost [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Charges to expense for new losses |  |  |  |  |  | 45.7 |  |  |  |  |  |
Environmental Clean-Up Costs | Pending Litigation | Middleport Litigation |  |  |  |  |  |  |  |  |  |  |  |
Environmental Exit Cost [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Accrual for environmental loss contingencies |  |  |  |  |  | $ 31.1 |  |  |  | $ 31.1 |  |
Pocatello |  |  |  |  |  |  |  |  |  |  |  |
Environmental Exit Cost [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Accrual for environmental loss contingencies |  |  |  |  | 107.5 |  |  | 117.8 | 107.5 |  |  |
Tribal permit fee |  | $ 1.5 | $ 1.5 |  |  |  |  |  |  |  | $ 1.5 |
Charges to expense for new losses | $ 72.8 |  |  |  | 72.8 |  |  | $ 82.6 |  |  |  |
Discount rate |  |  |  |  |  |  |  | 1.45% |  |  |  |
Estimated year one fees |  |  |  |  |  |  |  | $ 32.2 |  |  |  |
Estimated year two fees |  |  |  |  |  |  |  | 1.5 |  |  |  |
Estimated year three fees |  |  |  |  |  |  |  | 1.5 |  |  |  |
Estimated year four fees |  |  |  |  |  |  |  | 1.5 |  |  |  |
Estimated year five fees |  |  |  |  |  |  |  | 1.5 |  |  |  |
Expected aggregate undiscounted fees |  |  |  |  |  |  |  | 104.5 |  |  |  |
Pocatello | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |
Environmental Exit Cost [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Payments for attorney fees and unpaid permit fees |  |  |  | $ 20.5 |  |  |  |  |  |  |  |
Past years' permit fees |  |  |  |  |  |  | $ 10.5 |  |  |  |  |
Middleport |  |  |  |  |  |  |  |  |  |  |  |
Environmental Exit Cost [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Accrual for environmental loss contingencies |  |  |  |  | $ 159.4 |  |  | $ 142.7 | $ 159.4 |  |  |

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