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Environmental Obligations - Narrative (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Apr. 30, 2021 | Mar. 31, 2021 | Jun. 30, 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 | $ 10.8 | $ 21.4 | 32.2 |
Expected aggregate undiscounted fees |  |  |  | $ 104.5
Charges to expense for new losses |  |  | 42.7 | $ 82.6
Discount |  |  | $ 8.9 |
Discount rate |  |  | 2.31% |

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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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