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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
	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

X

- 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
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-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5618551-113959

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-Publisher FASB
-Name Accounting Standards Codification
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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
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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

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-Publisher FASB
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-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959

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Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments.

+ References

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