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Leases Textuals (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Apr. 01, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Jun. 30, 2017
Operating Leased Assets [Line Items] |  |  |  |  |
Contingent lease expense |  | $ 0.0 | $ 0.0 |  |
Predecessor |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |
Operating Leases, Rent Expense | $ 57.6 |  | 264.7 | $ 290.1 |
Capital Leased Assets, Gross |  | 125.3 | 77.9 |  |
Capital Leases, Lessee Balance Sheet, Assets by Major Class, Accumulated Depreciation |  |  | 48.6 |  |
Royalty Expense | $ 115.2 |  | 389.7 | $ 444.5 |
Successor |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |
Operating Leases, Rent Expense |  | 146.3 |  |  |
Contingent lease expense |  | 0.0 |  |  |
Capital Leased Assets, Gross |  | 125.3 |  |  |
Capital Leases, Lessee Balance Sheet, Assets by Major Class, Accumulated Depreciation |  | 20.6 |  |  |
Royalty Expense |  | $ 364.6 |  |  |
Federal Mineral Lease Term |  | ten years |  |  |
Minimum Annual Production Of Federal Coal Mining Leases On Original Amount |  | 1.00% |  |  |
Monthly federal royalties payable from sale using surface mining methods |  | 12.50% |  |  |
Monthly federal royalties payable of production using underground mining methods |  | 8.00% |  |  |
Period to redetermine royalty rates on Indian tribe leased coal reserves |  | every ten years |  |  |
Company lease Obligations Subject to Surety Bonds |  | $ 95.4 |  |  |
Capital lease and other obligations |  | $ 76.0 | $ 20.1 |  | $ 79.9

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- Definition Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84164817&loc=d3e45280-112737 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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