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Commitments and Contingent Liabilities - Schedule of Expected Aggregate Undiscounted Amount to Amounts Recognized (Details) - Black lung Benefit $ in Millions	Dec. 31, 2022 USD ($)
Loss Contingencies [Line Items]
Black lung liability, undiscounted	$ 88.4
Impact of discounting	(30.3)
Black lung liability, discounted	$ 58.1

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- Definition

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