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Acquisition of Shoal Creek Mine - Purchase Accounting (Details) - Shoal Creek $ in Millions | Dec. 03, 2018 USD ($)
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Business Acquisition [Line Items] |
Inventories | $ 39.7
Property, plant, equipment and mine development | 364.7
Current liabilities | (4.1)
Asset retirement obligations | (10.5)
Total purchase price | $ 389.8

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