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Environmental Obligations Narrative (Details) $ in Millions |  |  |  | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 28, 2017 USD ($) | May 08, 2012 USD ($) | Apr. 25, 2006 USD ($) | Dec. 31, 2018 USD ($) site | Dec. 31, 2018 USD ($) site party operable_unit | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2013 operable_unit | Dec. 31, 1998 USD ($) | Sep. 30, 2018 USD ($) | Dec. 31, 2015 USD ($)
Environmental Exit Cost [Line Items] |  |  |  |  |  |  |  |  |  |  |
Environmental reserves, excluding recoveries |  |  |  | $ 529.4 | $ 529.4 | $ 425.7 |  |  |  |  |
Environmental loss contingencies, net of expected recoveries, in excess of accrual |  |  |  |  | 190.0 |  |  |  |  |  |
Accrual for environmental loss contingencies |  |  |  | $ 521.5 | $ 521.5 | 411.8 | $ 360.4 |  |  |  | $ 334.3
Number of operable units evaluated and proposed for CMAs | operable_unit |  |  |  |  | 5 |  |  |  |  |  |
Number of operable units selected for CMAs | operable_unit |  |  |  |  |  |  |  | 3 |  |  |
Charges to expense for new losses |  |  |  |  | $ 178.2 | 105.6 | $ 80.8 |  |  |  |
Number of sites FMC is named as a potentially responsible party | site |  |  |  | 32 | 32 |  |  |  |  |  |
Number of sites FMC may be a potentially responsible party or equivalent | site |  |  |  | 53 | 53 |  |  |  |  |  |
Non-judicial process, parties involved | party |  |  |  |  | 70 |  |  |  |  |  |
Pocatello |  |  |  |  |  |  |  |  |  |  |
Environmental Exit Cost [Line Items] |  |  |  |  |  |  |  |  |  |  |
Accrual for environmental loss contingencies |  |  |  | $ 33.1 | $ 33.1 | 35.2 |  |  |  |  |
Tribal permit fee | $ 1.5 | $ 1.5 | $ 1.5 |  |  |  |  |  | $ 1.5 |  |
Tribal court decision on permit fees |  | $ 9.0 |  |  |  |  |  |  |  |  |
Middleport |  |  |  |  |  |  |  |  |  |  |
Environmental Exit Cost [Line Items] |  |  |  |  |  |  |  |  |  |  |
Accrual for environmental loss contingencies |  |  |  | 180.8 | $ 180.8 | $ 73.9 |  |  |  |  |
Pending Litigation | Middleport Litigation |  |  |  |  |  |  |  |  |  |  |
Environmental Exit Cost [Line Items] |  |  |  |  |  |  |  |  |  |  |
Accrual for environmental loss contingencies |  |  |  |  |  |  |  |  |  | $ 29.1 |
Operable units | operable_unit |  |  |  |  | 11 |  |  |  |  |  |
Charges to expense for new losses |  |  |  | 106.3 |  |  |  |  |  |  |
Cash outflow, maximum, after year 2021 |  |  |  | 10.0 | $ 10.0 |  |  |  |  |  |
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 |
Minimum | Pending Litigation | Middleport Litigation |  |  |  |  |  |  |  |  |  |  |
Environmental Exit Cost [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cash outflow in 2019 |  |  |  | 20.0 | 20.0 |  |  |  |  |  |
Cash outflow in 2020 |  |  |  | 20.0 | 20.0 |  |  |  |  |  |
Cash outflow in 2021 |  |  |  | 20.0 | 20.0 |  |  |  |  |  |
Maximum | Pending Litigation | Middleport Litigation |  |  |  |  |  |  |  |  |  |  |
Environmental Exit Cost [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cash outflow in 2019 |  |  |  | 30.0 | 30.0 |  |  |  |  |  |
Cash outflow in 2020 |  |  |  | 30.0 | 30.0 |  |  |  |  |  |
Cash outflow in 2021 |  |  |  | $ 30.0 | $ 30.0 |  |  |  |  |  |

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