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Basis of Presentation - Textuals (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Apr. 03, 2017
Successor
Fresh-Start Adjustment [Line Items]
Reorganization items, net	$ 12.8
Predecessor
Fresh-Start Adjustment [Line Items]
Reorganization items, net		$ (41.4)
Cash paid for “Reorganization items, net”		31.4
Voting shares received upon reorganization (less than 50%)			50.00%
Predecessor | Professional fee [Member]
Fresh-Start Adjustment [Line Items]
Reorganization items, net		(42.5)
Predecessor | accounts payable settlement (gains) losses [Member]
Fresh-Start Adjustment [Line Items]
Reorganization items, net		(0.7)
Predecessor | Interest Income [Member]
Fresh-Start Adjustment [Line Items]
Reorganization items, net		$ (0.4)

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Total amount of reorganization items.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 852
-SubTopic 10
-Section 55
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=84165509&loc=d3e56145-112766

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 852
-SubTopic 10
-Section 45
-Paragraph 9
-URI http://asc.fasb.org/extlink&oid=64805424&loc=d3e55730-112764

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