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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 | 6 Months Ended
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Jun. 30, 2017 | Apr. 01, 2017 | Jun. 30, 2016 | Mar. 31, 2016 | Jun. 30, 2016
Successor |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Total loss recognized in income | $ 2.9 |  |  |  |
(Loss) gain realized in income on derivatives | (0.3) |  |  |  |
Unrealized gain (loss) recognized in income on non- designated derivatives | 3.2 |  |  |  |
Successor | Foreign currency forward contract | Operating costs and expenses |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Total loss recognized in income | 2.9 |  |  |  |
(Loss) gain realized in income on derivatives | (0.3) |  |  |  |
Unrealized gain (loss) recognized in income on non- designated derivatives | $ 3.2 |  |  |  |
Predecessor |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Total loss recognized in income |  | $ (27.6) | $ (139.5) |  | $ (225.5)
Loss reclassified from other comprehensive loss into income |  | (27.6) | (62.4) |  | (141.1)
(Loss) gain realized in income on derivatives |  | 0.0 | (52.1) |  | (84.4)
Unrealized gain (loss) recognized in income on non- designated derivatives |  | 0.0 | (25.0) |  | 0.0
Predecessor | Fuel contracts |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Loss reclassified from other comprehensive loss into income |  |  |  | $ 9.0 |
Predecessor | Commodity swap contracts | Operating costs and expenses |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Total loss recognized in income |  | (11.0) | (18.6) |  | (58.9)
Loss reclassified from other comprehensive loss into income |  | (11.0) | (22.2) |  | (47.0)
(Loss) gain realized in income on derivatives |  | 0.0 | (1.8) |  | (11.9)
Unrealized gain (loss) recognized in income on non- designated derivatives |  | 0.0 | 5.4 |  | 0.0
Predecessor | Commodity swap contracts | Reorganization items, net |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Total loss recognized in income |  |  | (38.8) |  | (38.8)
Loss reclassified from other comprehensive loss into income |  |  | 0.0 |  | 0.0
(Loss) gain realized in income on derivatives |  |  | (38.8) |  | (38.8)
Unrealized gain (loss) recognized in income on non- designated derivatives |  |  |  |  |
Predecessor | Foreign currency forward contract |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Loss reclassified from other comprehensive loss into income |  |  |  | $ 13.6 |
Predecessor | Foreign currency forward contract | Operating costs and expenses |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Total loss recognized in income |  | (16.6) | (45.7) |  | (91.4)
Loss reclassified from other comprehensive loss into income |  | (16.6) | (40.2) |  | (94.1)
(Loss) gain realized in income on derivatives |  | 0.0 | 24.9 |  | 2.7
Unrealized gain (loss) recognized in income on non- designated derivatives |  | $ 0.0 | (30.4) |  | 0.0
Predecessor | Foreign currency forward contract | Reorganization items, net |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Total loss recognized in income |  |  | (36.4) |  | (36.4)
Loss reclassified from other comprehensive loss into income |  |  | 0.0 |  | 0.0
(Loss) gain realized in income on derivatives |  |  | (36.4) |  | (36.4)
Unrealized gain (loss) recognized in income on non- designated derivatives |  |  |  |  |

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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 Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + 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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