Subsequent Events (Details 3) - Subsequent Event [Member]	May 03, 2023
Subsequent Events [Line Items]
Percent of Shares, Retained, in conjunction with spin off	10.00%
Knife River Holding Company
Subsequent Events [Line Items]
Percent of Shares Distributed in conjunction with spin off	90.00%

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 830
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481674/830-30-50-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 855
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483399/855-10-50-2

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration