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Business (Details)	9 Months Ended
	Sep. 30, 2018 item
Number of mobile offshore drilling units	41
Ultra-deepwater floaters
Number of mobile offshore drilling units	23
Number of mobile offshore drilling units under construction	2
Harsh environment floaters
Number of mobile offshore drilling units	12
Number of mobile offshore drilling units under construction	1
Deepwater floaters
Number of mobile offshore drilling units	2
Midwater floaters
Number of mobile offshore drilling units	4
High specification jackups | Assets sold, not discontinued operations
Number of high specification jackups operated through contract completion or novation	1

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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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Number of mobile offshore drilling units.

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- Definition

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

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