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Segment Information (Narrative) (Details)
12 Months Ended
Dec. 31, 2018
service
segments
contract
Segment Reporting Information [Line Items]  
Number of operating segments 3
Number of reportable segments 2
Number of services | service 1
Number of contract drilling rigs 56
Number of drilling management contracts | contract 2
Ultra Deepwater Drillships [Member]  
Segment Reporting Information [Line Items]  
Number of contract drilling rigs 12
Moored Semisubmersible Rigs [Member]  
Segment Reporting Information [Line Items]  
Number of contract drilling rigs 3
Jackup Rigs [Member]  
Segment Reporting Information [Line Items]  
Number of contract drilling rigs 35
Floaters [Member] | Ultra Deepwater Drillships [Member]  
Segment Reporting Information [Line Items]  
Number of contract drilling rigs 10
Floaters [Member] | Dynamically Positioned Semisubmersible [Member]  
Segment Reporting Information [Line Items]  
Number of contract drilling rigs 9
Floaters [Member] | Moored Semisubmersible Rigs [Member]  
Segment Reporting Information [Line Items]  
Number of contract drilling rigs 3
Floaters [Member] | Asset under Construction [Member]  
Segment Reporting Information [Line Items]  
Number of contract drilling rigs 2
Jackups [Member] | Jackup Rigs [Member]  
Segment Reporting Information [Line Items]  
Number of contract drilling rigs 35
Jackups [Member] | Jackup Rigs Deployed [Member]  
Segment Reporting Information [Line Items]  
Number of contract drilling rigs 34
Jackups [Member] | Asset under Construction [Member]  
Segment Reporting Information [Line Items]  
Number of contract drilling rigs 1