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Segment Information (Narrative) (Details) - 12 months ended Dec. 31, 2019	rigs segments	jackup	contract
Segment Reporting Information [Line Items]
Number of operating segments | segments	3
Number of contract drilling rigs	74
Number of jackups leased by ARO	9	9
Number of drilling management contracts | contract			2
Floaters [Member] | Ultra Deepwater Drillships [Member]
Segment Reporting Information [Line Items]
Number of contract drilling rigs	16
Floaters [Member] | Dynamically Positioned Semisubmersible [Member]
Segment Reporting Information [Line Items]
Number of contract drilling rigs	8
Floaters [Member] | Moored Semisubmersible Rigs [Member]
Segment Reporting Information [Line Items]
Number of contract drilling rigs	2
Floaters [Member] | Asset under Construction [Member]
Segment Reporting Information [Line Items]
Number of contract drilling rigs	2
Jackups [Member]
Segment Reporting Information [Line Items]
Number of jackups leased by ARO | jackup		9
Rigs Held for Sale | jackup		3
Jackups [Member] | Jackup Rigs Deployed [Member]
Segment Reporting Information [Line Items]
Number of contract drilling rigs	41

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- Definition

Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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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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- Definition

Number Of Contract Drilling Rig

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- Definition

Number of Drilling Management Contracts

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Number of jackups leased by ARO

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- Definition

Number of rigs held for sale

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