Property, Plant, and Equipment, Number Impaired

No definition available.

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- Definition

Amount of increase (decrease) in loss contingency liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349

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- Definition

The loss recognized on termination of a contract.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 912
-SubTopic 275
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=68065670&loc=d3e54681-109401

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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.

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- Definition

The charge against earnings resulting from the aggregate write down of tangible assets from their carrying value to their fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=64862545&loc=d3e2921-110230

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=64827811&loc=d3e1361-107760

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MATERIAL CHARGES AND OTHER OPERATING ITEMS (Details) $ in Millions			12 Months Ended
	Sep. 30, 2016 drilling_unit	Sep. 30, 2015 drilling_unit	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($) drilling_unit	Dec. 31, 2015 USD ($) drilling_unit
Property, Plant and Equipment [Line Items]
Asset impairment charges			$ 0.0	$ 34.3	$ 329.8
Reversal of estimated settlement liaibility				1.4
Charge for termination of a contract					$ 7.6
Jack-up Rigs [Member]
Property, Plant and Equipment [Line Items]
Asset impairment charges				$ 34.3
Number of drilling units impaired \| drilling_unit	5	10		5	10
Material Charges and Other Operating Items [Member] \| Jack-up Rigs [Member]
Property, Plant and Equipment [Line Items]
Asset impairment charges				$ 34.3	$ 329.8