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Environmental Obligations - Narrative (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Apr. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020
Environmental Remediation Obligations [Abstract] |  |  |
Environmental loss contingencies, net of expected recoveries, in excess of accrual |  | $ 170.0 |
Pocatello |  |  |
Environmental Exit Cost [Line Items] |  |  |
Payments for attorney fees and unpaid permit fees |  | 21.4 |
Discount |  | $ 8.9 |
Discount rate |  | 2.31% |
Expected aggregate undiscounted fees |  | $ 84.3 | $ 104.5
Charges to expense for new losses |  | $ 53.5 | $ 82.6
Pocatello | Subsequent Event |  |  |
Environmental Exit Cost [Line Items] |  |  |
Payments for attorney fees and unpaid permit fees | $ 9.3 |  |

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- Definition Undiscounted Accrual for Environmental Loss Contingencies, Charges to Expense for New Losses + References No definition available. + Details
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- Definition Amount of expense for newly incurred environmental loss contingencies. Includes, but is not limited to, remediation expense and interest accretion. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.Y.Q2) -URI http://asc.fasb.org/extlink&oid=27011672&loc=d3e149879-122751 + Details
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- Definition Amount of imputed interest necessary to reduce (reconcile) the undiscounted amount of the accrual for environmental loss contingencies to the present value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 5.Y.Q1) -URI http://asc.fasb.org/extlink&oid=27011672&loc=d3e149879-122751 + Details
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- Definition Best estimate of the reasonably possible loss exposure in excess of the amount accrued for remediation, site restoration, postclosure, monitoring commitments, or other exit costs associated with the sale, disposal or abandonment of a particular property resulting from unanticipated contamination of the assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 5.Y.Q4) -URI http://asc.fasb.org/extlink&oid=27011672&loc=d3e149879-122751 + Details
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