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Adjustments to PP&E (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Apr. 01, 2017
--- | --- | --- | --- | ---
Fresh-Start Adjustment [Line Items] |  |  |  |
Fresh-start adjustment, increase (decrease), property, plant, equipment and mine development, net |  |  |  | $ 3,461.4
PP&E, fair value |  |  |  | 3,461.4
Asset retirement obligations | $ 752.3 | $ 750.2 | $ 691.1 |
Land and coal interests |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |
PP&E, fair value |  |  |  | 3,504.7
Asset retirement obligations |  |  |  | 281.2
Buildings and improvements |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |
Postconfirmation, property, plant, equipment and mine development, net |  |  |  | 466.1
Machinery and equipment |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |
Postconfirmation, property, plant, equipment and mine development, net |  |  |  | $ 940.5

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- Definition The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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- Definition Total fresh-start adjustment to property and equipment, net. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6918054&loc=SL2890621-112765 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=84165509&loc=d3e56426-112766 + Details
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- Definition Total property and equipment, net at the balance sheet date after fresh-start adjustments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6918054&loc=SL2890621-112765 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=84165509&loc=d3e56426-112766 + Details
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