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
-Name Accounting Standards Codification
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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Supplemental Financial Information Revenue from External Customers by Geographic Areas (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Sales Revenue, Services, Net [Member] \| Geographic Concentration Risk [Member]
Revenue, Major Customer [Line Items]
Revenues	$ 457.5	$ 909.6	$ 928.6	$ 1,723.6
Angola [Member] \| Sales Revenue, Services, Net [Member] \| Geographic Concentration Risk [Member]
Revenue, Major Customer [Line Items]
Revenues	115.9	132.4	237.6	268.6
AUSTRALIA \| Sales Revenue, Services, Net [Member] \| Geographic Concentration Risk [Member]
Revenue, Major Customer [Line Items]
Revenues	55.3	62.3	109.9	124.8
EGYPT \| Sales Revenue, Services, Net [Member] \| Geographic Concentration Risk [Member]
Revenue, Major Customer [Line Items]
Revenues	53.4	36.5	106.6	36.5
Brazil [Member] \| Sales Revenue, Services, Net [Member] \| Geographic Concentration Risk [Member]
Revenue, Major Customer [Line Items]
Revenues	48.7	81.7	96.5	202.7
United Kingdom [Member] \| Sales Revenue, Services, Net [Member] \| Geographic Concentration Risk [Member]
Revenue, Major Customer [Line Items]
Revenues	36.7	69.7	67.9	143.5
US Gulf Of Mexico [Member] \| Sales Revenue, Services, Net [Member] \| Geographic Concentration Risk [Member]
Revenue, Major Customer [Line Items]
Revenues	33.0	304.5	77.3	464.7
Other Geographic Areas [Member] \| Sales Revenue, Services, Net [Member] \| Geographic Concentration Risk [Member]
Revenue, Major Customer [Line Items]
Revenues	$ 114.5	$ 222.5	$ 232.8	$ 482.8
Floaters [Member] \| Angola [Member] \| Sales Revenue, Services, Net [Member] \| Geographic Concentration Risk [Member]
Revenue, Major Customer [Line Items]
Concentration Risk, Percentage	87.00%	88.00%	86.00%	87.00%
Floaters [Member] \| AUSTRALIA \| Sales Revenue, Services, Net [Member] \| Geographic Concentration Risk [Member]
Revenue, Major Customer [Line Items]
Concentration Risk, Percentage	78.00%
Floaters [Member] \| US Gulf Of Mexico [Member] \| Sales Revenue, Services, Net [Member] \| Geographic Concentration Risk [Member]
Revenue, Major Customer [Line Items]
Concentration Risk, Percentage	10.00%	25.00%	92.00%	89.00%
Jackup [Member] \| US Gulf Of Mexico [Member] \| Sales Revenue, Services, Net [Member] \| Geographic Concentration Risk [Member]
Revenue, Major Customer [Line Items]
Concentration Risk, Percentage	46.00%	3.00%	37.00%	4.00%
Sales Revenue, Net [Member]
Revenue, Major Customer [Line Items]
Gain (Loss) on Contract Termination			$ 205.0