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Business (Details) - item		6 Months Ended
	May 31, 2017	Jun. 30, 2017
Continuing operations
Number of mobile offshore drilling units		44
Number of Ultra-Deepwater Floaters		30
Number of Harsh Environment Floaters		7
Number of Deepwater Floaters		3
Number of Midwater Floaters (in drilling units)		4
Number of Ultra-Deepwater drillships under construction (in drilling units)		4
Sell of Standard Jackup and swamp barge market sectors | Assets sold, not discontinued operations
Number of high specification jackups operated through contract completion or novation	3
Number of High-Specification Jackups (in drilling units)	10
Number of High-Specification Jackup under construction (in drilling units)	5
Sell of Standard Jackup and swamp barge market sectors | Assets sold, not discontinued operations | Continuing operations
Number of high specification jackups operated through contract completion or novation		2

X

- Definition

Number of Deepwater Floaters. Deepwater Floaters are generally those other semisubmersible rigs and drillships capable of drilling in water depths between 4,500 feet and 7,500 feet.

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- Definition

Number of Harsh Environment Floaters. Harsh Environment Floaters are capable of drilling in harsh environments in water depths between 1,500 feet and 10,000 feet and have greater displacement, which offers larger variable load capacity, more usable deck space and better motion characteristics.

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- Definition

Number of High-Specification Jackups. High-Specification Jackups are harsh environment and high-performance jackups. Jackups are self-elevating drilling platforms that have legs that can be lowered to the ocean floor to establish a foundation to support the drilling platform. These units are generally suited for water depths of 400 feet or less.

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- Definition

Number of high specification jackups to be operated by the entity through completion or novation of the drilling contracts.

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- Definition

Number of High-Specification Jackups under construction.

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- Definition

Number of Midwater Floaters. Midwater Floaters are non-high-specification semisubmersibles with a water depth capacity of less than 4,500 feet.

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No definition available.

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X

- Definition

Number of mobile offshore drilling units we own, had partial ownership interests in or operated at the measurement date.

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- Definition

Number of Ultra-Deepwater drillships under construction.

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- Definition

Number of Ultra-Deepwater Floaters. Ultra-Deepwater Floaters are equipped with high pressure mud pumps and are capable of drilling units in water depths of 7,500 feet or greater.

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