For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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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.

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Gain (loss) related to the termination of a contract between the parties. The termination may be due to many causes including early termination of a lease by a lessee, a breach of contract by one party, or a failure to perform.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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Supplemental Financial Information Revenue from External Customers by Geographic Areas (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Sales Revenue, Services, Net [Member] \| Customer Concentration Risk [Member]
Revenue, Major Customer [Line Items]
Concentration Risk, Percentage	100.00%	100.00%	100.00%	100.00%
Sales Revenue, Services, Net [Member] \| Geographic Concentration Risk [Member]
Revenue, Major Customer [Line Items]
Revenues	$ 548,200,000.00	$ 1,012,200,000.00	$ 2,271,800,000.00	$ 3,235,100,000.00
United Kingdom [Member] \| Sales Revenue, Services, Net [Member] \| Geographic Concentration Risk [Member] \| Floaters [Member]
Revenue, Major Customer [Line Items]
Revenues	60,500,000	91,500,000	204,000,000	316,400,000
US Gulf Of Mexico [Member] \| Sales Revenue, Services, Net [Member] \| Geographic Concentration Risk [Member]
Revenue, Major Customer [Line Items]
Revenues	$ 33,600,000.00	$ 363,000,000.00	$ 498,300,000.00	$ 972,800,000.00
US Gulf Of Mexico [Member] \| Sales Revenue, Services, Net [Member] \| Geographic Concentration Risk [Member] \| Floaters [Member]
Revenue, Major Customer [Line Items]
Concentration Risk, Percentage	41.00%	90.00%	86.00%	86.00%
Angola [Member] \| Sales Revenue, Services, Net [Member] \| Geographic Concentration Risk [Member]
Revenue, Major Customer [Line Items]
Revenues	$ 142,700,000	$ 136,600,000	$ 411,300,000	$ 488,300,000
Angola [Member] \| Sales Revenue, Services, Net [Member] \| Geographic Concentration Risk [Member] \| Floaters [Member]
Revenue, Major Customer [Line Items]
Concentration Risk, Percentage	87.00%	87.00%	87.00%	90.00%
Brazil [Member] \| Sales Revenue, Services, Net [Member] \| Geographic Concentration Risk [Member] \| Floaters [Member]
Revenue, Major Customer [Line Items]
Revenues	$ 48,600,000	$ 112,900,000	$ 251,300,000	$ 351,300,000
Other Geographic Areas [Member] \| Sales Revenue, Services, Net [Member] \| Geographic Concentration Risk [Member]
Revenue, Major Customer [Line Items]
Revenues	$ 262,800,000.00	$ 308,200,000.00	906,900,000.00	1,106,300,000.00
Sales Revenue, Net [Member]
Revenue, Major Customer [Line Items]
Gain (Loss) on Contract Termination			$ 205,000,000	$ 129,000,000
ConocoPhillips [Member] \| Sales Revenue, Services, Net [Member] \| Customer Concentration Risk [Member]
Revenue, Major Customer [Line Items]
Concentration Risk, Percentage		5.00%	3.00%	3.00%
ConocoPhillips [Member] \| Sales Revenue, Services, Net [Member] \| Customer Concentration Risk [Member] \| Floaters [Member]
Revenue, Major Customer [Line Items]
Concentration Risk, Percentage	2.00%	6.00%	12.00%	4.00%
ENSCO DS-9 [Member] \| Sales Revenue, Net [Member]
Revenue, Major Customer [Line Items]
Gain (Loss) on Contract Termination			$ 185,000,000	$ 18,400,000