Commitments and Contingencies (Environmental Compliance) (Details) - USD ($) $ in Millions	9 Months Ended
Sep. 30, 2022	Dec. 31, 2021
Site Contingency [Line Items]
Insurance Settlements Receivable	$ 3.7
Fort Berthold Indian Reservation
Site Contingency [Line Items]
Accrual of environmental loss contingencies	4.2	$ 1.0
Maximum \| Fort Berthold Indian Reservation
Site Contingency [Line Items]
Potential liability for environmental exposures	5.2
Minimum \| Fort Berthold Indian Reservation
Site Contingency [Line Items]
Potential liability for environmental exposures	$ 4.2

Total costs accrued as of the balance sheet date for environmental loss contingencies.

Reference 1: http://www.xbrl.org/2003/role/recommendedDisclosureRef
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