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Segment Information (Narrative) (Details) - 12 months ended Dec. 31, 2020 | rigs floater drillship | jackup | drillship | Total | contract
--- | --- | --- | --- | --- | ---
Segment Reporting Information [Line Items] |  |  |  |  |
Number of operating segments | drillship | 4 |  |  |  |
Number of contract drilling rigs | 61 |  |  |  |
Number of jackups leased by ARO |  | 9 | 9 |  |
Number of drilling management contracts | contract |  |  |  |  | 2
Total number of contract drilling rigs | 61 |  |  |  |
Floaters [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total number of contract drilling rigs | 16 |  |  |  |
Floaters [Member] | Ultra Deepwater Drillships [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Number of contract drilling rigs | floater | 11 |  |  |  |
Floaters [Member] | Dynamically Positioned Semisubmersible [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Number of contract drilling rigs | floater | 4 |  |  |  |
Floaters [Member] | Moored Semisubmersible Rigs [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Number of contract drilling rigs | floater | 1 |  |  |  |
Jackups [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total number of contract drilling rigs | 36 |  |  |  |
ARO |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Number of contract drilling rigs | floater | 7 |  |  |  |
Total number of contract drilling rigs | 7 |  |  |  |
Jackup Rigs Member [Member] | Jackups [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Number of contract drilling rigs | drillship | 36 |  |  |  |
Other [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total number of contract drilling rigs |  |  |  | 9 |

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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. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8672-108599 + Details
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- Definition 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. + References No definition available. + Details
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- Definition Number Of Contract Drilling Rig + References No definition available. + Details
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- Definition Total Number Of Contract Drilling Rigs + References No definition available. + Details
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