Business Acquisition, Equity Interest Issued or Issuable, Value Assigned, Per Share

No definition available.

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- Definition

Business Combination, Consideration Transferred, Excluding Debt

+ References

No definition available.

+ Details

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- Definition

Business Combination, Consideration Transferred, Working Capital Adjustment

+ References

No definition available.

+ Details

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- Definition

Limited Liability Company (LLC) or Limited Partnership (LP), Members or Limited Partners, Ownership Interest Purchased

+ References

No definition available.

+ Details

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- Definition

Payments to Acquire Businesses, Discount Note Payable

+ References

No definition available.

+ Details

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- Definition

Proceeds from Issuance or Sale of Equity, Net of Fees

+ References

No definition available.

+ Details

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- Definition

Amount of direct costs of the business combination including legal, accounting, and other costs incurred to consummate the business acquisition.

+ References

No definition available.

+ Details

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Period Type:	instant

- Definition

Value of equity interests (such as common shares, preferred shares, or partnership interest) issued or issuable to acquire the entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (b)(4)
-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479

+ Details

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Period Type:	instant

- Definition

Number of shares of equity interests issued or issuable to acquire entity.

+ References

+ 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

Percentage of voting equity interests acquired at the acquisition date in the business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463

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- Definition

For receivables acquired in a business combination, excluding certain loans and debt securities acquired in a transfer (as defined), this element represents the fair value of the receivables acquired, by major class of receivable, such as loans, direct finance leases (as defined), and any other class of receivables.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472

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Period Type:	instant

- Definition

Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 30
-Section 30
-Paragraph 7
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- Definition

Amount of liabilities incurred by the acquirer as part of consideration transferred in a business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 25
-Paragraph 5
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- Definition

This element represents the amount of earnings or loss of the acquiree since the acquisition date included in the consolidated income statement for the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)
-URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463

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- Definition

This element represents the amount of revenue of the acquiree since the acquisition date included in the consolidated income statement for the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Paragraph 2
-Subparagraph (h)(1)
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- Definition

Amount of payment greater than the preceding installment payments to be paid at final maturity date of debt.

+ References

No definition available.

+ Details

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- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
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- Definition

The number of units or percentage investment held by one or more members or limited partners of the LLC or LP.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 272
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70478-108055

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- Definition

Decrease in noncontrolling interest (for example, but not limited to, redeeming or purchasing the interests of noncontrolling shareholders, issuance of shares (interests) by the non-wholly owned subsidiary to the parent entity for other than cash, and a buyback of shares (interest) by the non-wholly owned subsidiary from the noncontrolling interests).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 45
-Paragraph 24
-URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4616395-111683

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- Definition

The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

+ References

No definition available.

+ Details

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- Definition

The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

+ References

No definition available.

+ Details

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- Definition

The cash outflow for cost incurred directly with the issuance of an equity security.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Financing Activities
-URI http://asc.fasb.org/extlink&oid=6513228

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585

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- Definition

The cash outflow associated with the purchase of noncontrolling interest during the period.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (b)
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- Definition

The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Investing Activities
-URI http://asc.fasb.org/extlink&oid=6516133

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(West Auriga) (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions						2 Months Ended	12 Months Ended			21 Months Ended
	Jun. 19, 2015	Jul. 21, 2014	Mar. 21, 2014	Dec. 13, 2013	Oct. 24, 2012	Dec. 31, 2012	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2015	Nov. 04, 2014
Business Acquisition [Line Items]
Noncontrolling interest, ownership percentage by parent							50.00%			50.00%
Consideration transferred							$ 2,695.0
Contingent consideration							898.8
Cash							1,796.2
Plus: Working capital adjustment							2.2
Proceeds on issuance of equity, net of fees							0.0	$ 937.8	$ 464.8
Payments of stock issuance costs						$ 18.8
Goodwill							$ 3.2	3.2		$ 3.2
Purchase of non-controlling interest								(372.8)
West Auriga
Business Acquisition [Line Items]
Percentage of voting interests acquired			100.00%
Consideration transferred			$ 1,240.0
Contingent consideration			443.1
Consideration transferred, excluding debt			797.0
Cash			696.9
Discount note issued			100.0
Plus: Working capital adjustment			$ 330.4
Business acquisition, equity interest issued or issuable, share price			$ 30.60
Proceeds on issuance of equity, net of fees			$ 401.3
Payments of stock issuance costs			14.7
Goodwill			2.9
Business acquisition, transaction costs			$ 0.2
Revenues										164.5
Business combination, earnings or loss of acquiree since acquisition date, actual										$ 46.1
Seadrill Capricorn Holdings LLC
Business Acquisition [Line Items]
Noncontrolling interest, ownership percentage by parent			51.00%	51.00%							51.00%
Noncontrolling interest, ownership percentage by noncontrolling owners			49.00%								49.00%
Percentage of ownership interest in limited liability company (LLC)				51.00%	51.00%
Seadrill Operating LP
Business Acquisition [Line Items]
Noncontrolling interest, ownership percentage by parent	58.00%
Ownership interest purchased		28.00%
Payments to acquire additional interest in subsidiaries		$ 372.8
Percentage of ownership interest in limited liability company (LLC)	58.00%	58.00%		30.00%	30.00%
Purchase of non-controlling interest		$ (93.2)
US $100 Discount Note
Business Acquisition [Line Items]
Balloon payment to be paid			$ 103.7
Stock Issued to Public \| West Auriga
Business Acquisition [Line Items]
Plus: Working capital adjustment			$ 330.4
Common units issued as consideration (in shares)			11,960,000
Seadrill Limited \| West Auriga
Business Acquisition [Line Items]
Common units issued as consideration (in shares)			1,633,987
Trade Accounts Receivable \| West Auriga
Business Acquisition [Line Items]
Acquired receivables, fair value			$ 28.3
Mobilization Fee Receivable \| West Auriga
Business Acquisition [Line Items]
Acquired receivables, fair value			92.4
Seadrill \| Seadrill Capricorn Holdings LLC \| West Auriga
Business Acquisition [Line Items]
Business acquisition, equity interest issued, value assigned			$ 341.5
Total Before Non- Controlling interest
Business Acquisition [Line Items]
Purchase of non-controlling interest								$ (279.6)
Total Before Non- Controlling interest \| Seadrill Operating LP
Business Acquisition [Line Items]
Purchase of non-controlling interest		$ (279.6)