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Environmental Obligations - Narrative (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended	6 Months Ended	9 Months Ended	12 Months Ended
	Apr. 30, 2021	Jun. 30, 2021	Jun. 30, 2021	Sep. 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	$ 8.9
Discount rate		2.31%	2.31%

X

- Definition

Undiscounted Accrual for Environmental Loss Contingencies, Charges to Expense for New Losses

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Amount of expense for newly incurred environmental loss contingencies. Includes, but is not limited to, remediation expense and interest accretion.

+ References

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Amount of imputed interest necessary to reduce (reconcile) the undiscounted amount of the accrual for environmental loss contingencies to the present value.

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Rate applied to the undiscounted amount of environmental loss contingencies to arrive at the present value recorded as of the balance sheet date.

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Amount of cash outflow to settle environmental loss contingencies.

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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.

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