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Derivatives and Fair Value Measurements - Gains and Losses on Hedging Derivatives (Details) - Designated as Hedging Instrument - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Successor |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gain (loss) realized in income on derivatives | $ (2.4) |
Unrealized gain (loss) recognized in income on non- designated derivatives | (1.8) |
Total loss recognized in income | (4.2) |
Successor | Commodity swap contracts | Reorganization items, net |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gain (loss) realized in income on derivatives | (2.4) |
Unrealized gain (loss) recognized in income on non- designated derivatives | (1.8) |
Total loss recognized in income | $ (4.2) |
Predecessor |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Loss reclassified from other comprehensive loss into income |  | $ (27.6)
Total loss recognized in income |  | (27.6)
Predecessor | Commodity swap contracts | Operating costs and expenses |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Loss reclassified from other comprehensive loss into income |  | (11.0)
Total loss recognized in income |  | (11.0)
Predecessor | Foreign currency cash flow hedge contracts | Operating costs and expenses |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Loss reclassified from other comprehensive loss into income |  | (16.6)
Total loss recognized in income |  | $ (16.6)

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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 + Details
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- Definition The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4D -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624177-113959 + Details
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- Definition The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 + Details
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- Definition Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 + Details
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