Environmental Obligations - Narrative (Details) - USD ($) $ in Millions |
1 Months Ended | 3 Months Ended | 12 Months Ended |
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Apr. 30, 2021 |
Mar. 31, 2021 |
Dec. 31, 2020 |
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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 No definition available.
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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. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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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. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Rate applied to the undiscounted amount of environmental loss contingencies to arrive at the present value recorded as of the balance sheet date. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of cash outflow to settle environmental loss contingencies. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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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. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- References No definition available.
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