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Acquisition of Shoal Creek Mine Purchase Accounting (Details) - Shoal Creek - USD ($) $ in Millions | 13 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 03, 2018
Allocations |  |
Inventories | $ 39.9 | $ 39.7
Property, plant, equipment and mine development | 365.3 | 364.7
Current liabilities | (4.1) | (4.1)
Asset retirement obligations | (11.3) | (10.5)
Total purchase price | 389.8 | $ 389.8
Adjustments |  |
Fair Value Adjustment, Inventory | 0.2 |
Fair Value Adjustment, Property, Plant, and Equipment | 0.6 |
Fair Value Adjustment, Current liabilities | 0.0 |
Fair Value Adjustment, Asset retirement obligations | 0.8 |
Total purchase price | $ 0.0 |

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