Property, Plant, and Equipment, Number Impaired

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- Definition

Amount of interest capitalized, including amount of allowance for funds used during construction.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Allowance for Funds Used during Construction
-URI http://asc.fasb.org/extlink&oid=6504829

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 980
-SubTopic 835
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6501662&loc=d3e56162-110433

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- Definition

Costs incurred and are directly related to generating maintenance revenues. Also includes cost of maintenance on client contracts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.2(e))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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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

Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(13))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-Publisher FASB
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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-Publisher FASB
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-Section S99
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-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

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- Definition

Stated as a percentage, the estimated or actual value of the asset at the end of its useful life or when it is no longer serviceable (cannot be used for its original purpose) divided by its [historical] capitalized cost.

+ References

No definition available.

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- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ 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.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 2
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-URI http://asc.fasb.org/extlink&oid=64827811&loc=d3e1361-107760

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Property and Depreciation and Impairments (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 ($) drilling_unit	Sep. 29, 2016 USD ($)	Sep. 29, 2015 USD ($)
Property, Plant and Equipment [Line Items]
Interest incurred and capitalized during construction			$ 0.0	$ 0.0	$ 16.2
Repairs and maintenance expense, continuing operations			113.0	118.0	129.0
Property value			6,552.7	7,060.0
Asset impairment charges			$ 0.0	$ 34.3	$ 329.8
Jack-up Rigs [Member]
Property, Plant and Equipment [Line Items]
Number of drilling units impaired \| drilling_unit	5	10		5	10
Asset impairment charges				$ 34.3
Jack-up drilling rigs: Hulls [Member]
Property, Plant and Equipment [Line Items]
Salvage Value			10.00%
Jack-up drilling rigs: Legs [Member]
Property, Plant and Equipment [Line Items]
Salvage Value			10.00%
Jack-up drilling rigs: Quarters [Member]
Property, Plant and Equipment [Line Items]
Salvage Value			10.00%
Life (in years)			25 years
Jack-up Rigs: Impaired [Member]
Property, Plant and Equipment [Line Items]
Property value				43.6	$ 457.8	$ 43.6	$ 457.8
Drillships: Hulls [Member]
Property, Plant and Equipment [Line Items]
Salvage Value			10.00%
Life (in years)			35 years
Drill pipe and tubular equipment [Member]
Property, Plant and Equipment [Line Items]
Salvage Value			10.00%
Life (in years)			4 years
Minimum [Member] \| Jack-up drilling rigs: Hulls [Member]
Property, Plant and Equipment [Line Items]
Life (in years)			25 years
Minimum [Member] \| Jack-up drilling rigs: Legs [Member]
Property, Plant and Equipment [Line Items]
Life (in years)			25 years
Minimum [Member] \| Jack-up drilling rigs: Drilling equipment [Member]
Property, Plant and Equipment [Line Items]
Salvage Value			0.00%
Life (in years)			2 years
Minimum [Member] \| Drillships: Drilling equipment [Member]
Property, Plant and Equipment [Line Items]
Salvage Value			0.00%
Life (in years)			2 years
Minimum [Member] \| Other property and equipment [Member]
Property, Plant and Equipment [Line Items]
Life (in years)			3 years
Maximum [Member] \| Jack-up drilling rigs: Hulls [Member]
Property, Plant and Equipment [Line Items]
Life (in years)			35 years
Maximum [Member] \| Jack-up drilling rigs: Legs [Member]
Property, Plant and Equipment [Line Items]
Life (in years)			30 years
Maximum [Member] \| Jack-up drilling rigs: Drilling equipment [Member]
Property, Plant and Equipment [Line Items]
Salvage Value			10.00%
Life (in years)			25 years
Maximum [Member] \| Drillships: Drilling equipment [Member]
Property, Plant and Equipment [Line Items]
Salvage Value			10.00%
Life (in years)			25 years
Maximum [Member] \| Other property and equipment [Member]
Property, Plant and Equipment [Line Items]
Life (in years)			30 years
Material Charges and Other Operating Items [Member] \| Jack-up Rigs [Member]
Property, Plant and Equipment [Line Items]
Asset impairment charges				$ 34.3	$ 329.8