Commitments and Contingent Liabilities (Details) $ in Millions	3 Months Ended
Mar. 31, 2017 USD ($) drilling_unit	Dec. 31, 2016 USD ($)
Long-term Purchase Commitment [Line Items]
IRS proposed unfavorable tax adjustments	$ 85.0
Gross unrecognized tax benefits	121.0	$ 120.0
Tax impact of unrecognized tax benefits, if reversed	60.0
Outstanding letters of credit	9.9
Newbuild Jack-Up Rigs [Member]
Long-term Purchase Commitment [Line Items]
Long-term purchase commitment, amount	$ 1,250.0
Saudi Arabia Joint Venture [Member] \| Maximum [Member]
Long-term Purchase Commitment [Line Items]
Number of drilling rigs to be purchased by joint venture \| drilling_unit	20

The number of drilling rigs expected to be purchase by the joint venture.

No definition available.

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- Definition

Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248

+ Details

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Period Type:	instant

- Definition

Estimated amount of loss resulting from an adverse tax position.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (d)(3)
-URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32718-109319

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ 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

Amount of unrecognized tax benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15A
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=65882285&loc=SL6600010-109319

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Unrecognized Tax Benefit
-URI http://asc.fasb.org/extlink&oid=6527854

+ Details

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- Definition

The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

+ References

+ Details

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- Details

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- Details

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- Details

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