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Description Of The Business And Summary Of Significant Accounting Policies (Narrative) (Details) shares in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 USD ($) | Sep. 30, 2015 USD ($) | Jun. 30, 2015 USD ($) | Mar. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Sep. 30, 2014 USD ($) | Jun. 30, 2014 USD ($) | Mar. 31, 2014 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) segments continent country service shares | Dec. 31, 2014 USD ($) shares | Dec. 31, 2013 USD ($) shares
Description Of The Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of contract drilling rigs |  |  |  |  |  |  |  |  |  | 64 |  |
Number of rigs under construction |  |  |  |  |  |  |  |  |  | 4 |  |
Number of different countries having drilling contracts spanning | country |  |  |  |  |  |  |  |  |  | 15 |  |
Number of different continents having drilling contracts | continent |  |  |  |  |  |  |  |  |  | 6 |  |
Net foreign currency exchange gains (losses) |  |  |  |  |  |  |  |  |  | $ 5,400,000 | $ (2,600,000) | $ 6,400,000
Short-term Investments | $ 1,180,000,000 |  |  |  | $ 757,300,000 |  |  |  |  | 1,180,000,000 | 757,300,000 |
Cost of Services, Depreciation | 149,700,000 | $ 145,200,000 | $ 140,500,000 | $ 137,100,000 | 139,400,000 | $ 135,200,000 | $ 132,200,000 | $ 131,100,000 |  | $ 572,500,000 | $ 537,900,000 | $ 496,200,000
Number of operating segments | segments |  |  |  |  |  |  |  |  |  | 3 |  |
Number of reportable segments | segments |  |  |  |  |  |  |  |  |  | 2 |  |
Number of services | service |  |  |  |  |  |  |  |  |  | 1 |  |
Antidilutive share options excluded from computation of diluted earnings per share | shares |  |  |  |  |  |  |  |  |  | 0.8 | 0.4 | 0.3
Impairment of Long Lived Assets |  |  |  |  |  |  |  |  |  | $ 2,618,900,000 | $ 2,463,100,000 |
Deferred tax assets, noncurrent | 94,800,000 |  |  |  | 63,100,000 |  |  |  |  | 94,800,000 | 63,100,000 |
Deferred tax liabilities, noncurrent | 4,400,000 |  |  |  | 162,900,000 |  |  |  |  | 4,400,000 | 162,900,000 |
Impairment of Long-Lived Assets Held-for-use | 2,460,300,000 |  |  |  | 517,300,000 |  |  |  |  | 2,470,300,000 | 1,220,800,000 |
New Accounting Pronouncement, Early Adoption, Effect [Member] |  |  |  |  |  |  |  |  |  |  |  |
Description Of The Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Deferred tax assets, current |  |  |  |  | (43,800,000) |  |  |  |  |  | (43,800,000) |
Deferred tax assets, noncurrent |  |  |  |  | 43,800,000 |  |  |  |  |  | 43,800,000 |
Deferred tax liabilities, current |  |  |  |  | 2,500,000 |  |  |  |  |  | 2,500,000 |
Deferred tax liabilities, noncurrent |  |  |  |  | 2,500,000 |  |  |  |  |  | 2,500,000 |
Deferred Mobilization Costs [Member] |  |  |  |  |  |  |  |  |  |  |  |
Description Of The Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Other assets | 77,000,000 |  |  |  | 95,700,000 |  |  |  |  | 77,000,000 | 95,700,000 |
Deferred Regulatory Certification And Compliance Costs [Member] |  |  |  |  |  |  |  |  |  |  |  |
Description Of The Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Other assets | $ 21,200,000 |  |  |  | $ 20,000,000 |  |  |  |  | $ 21,200,000 | $ 20,000,000 |
Ultra Deepwater Drillships [Member] |  |  |  |  |  |  |  |  |  |  |  |
Description Of The Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of contract drilling rigs |  |  |  |  |  |  |  |  |  | 10 |  |
Semisubmersible Rigs [Member] |  |  |  |  |  |  |  |  |  |  |  |
Description Of The Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of contract drilling rigs |  |  |  |  |  |  |  |  |  | 13 |  |
Moored Semisubmersible Rigs [Member] |  |  |  |  |  |  |  |  |  |  |  |
Description Of The Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of contract drilling rigs |  |  |  |  |  |  |  |  |  | 3 |  |
Jackup Rigs [Member] |  |  |  |  |  |  |  |  |  |  |  |
Description Of The Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of contract drilling rigs |  |  |  |  |  |  |  |  |  | 42 |  |
Ensco DS-9 [Member] | Sales Revenue, Net [Member] |  |  |  |  |  |  |  |  |  |  |  |
Description Of The Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Contract Termination |  |  |  |  |  |  |  |  |  | $ 98,300,000 |  |
Other Nonrecurring Income |  |  |  |  |  |  |  |  |  | 18,400,000 |  |
Ensco DS-4 [Member] | Sales Revenue, Net [Member] |  |  |  |  |  |  |  |  |  |  |  |
Description Of The Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Contract Termination |  |  |  |  |  |  |  |  |  | $ 110,600,000.0 |  |
Minimum [Member] | Drilling rigs and equipment [Member] |  |  |  |  |  |  |  |  |  |  |  |
Description Of The Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  |  |  |  |  |  |  |  | 4 years |  |
Minimum [Member] | Building and Building Improvements [Member] |  |  |  |  |  |  |  |  |  |  |  |
Description Of The Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  |  |  |  |  |  |  |  | 2 years |  |
Minimum [Member] | Other Equipment And Computer Hardware Software [Member] |  |  |  |  |  |  |  |  |  |  |  |
Description Of The Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  |  |  |  |  |  |  |  | 3 years |  |
Maximum [Member] | Drilling rigs and equipment [Member] |  |  |  |  |  |  |  |  |  |  |  |
Description Of The Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  |  |  |  |  |  |  |  | 35 years |  |
Maximum [Member] | Building and Building Improvements [Member] |  |  |  |  |  |  |  |  |  |  |  |
Description Of The Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  |  |  |  |  |  |  |  | 30 years |  |
Maximum [Member] | Other Equipment And Computer Hardware Software [Member] |  |  |  |  |  |  |  |  |  |  |  |
Description Of The Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  |  |  |  |  |  |  |  | 6 years |  |
Change in useful lives [Member] | Scenario, Forecast [Member] | Change in depreciation expense [Member] |  |  |  |  |  |  |  |  |  |  |  |
Description Of The Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cost of Services, Depreciation |  |  |  |  |  |  |  |  | $ 20,000,000 |  |  |
Impairment impact [Member] | Scenario, Forecast [Member] | Change in depreciation expense [Member] |  |  |  |  |  |  |  |  |  |  |  |
Description Of The Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cost of Services, Depreciation |  |  |  |  |  |  |  |  | $ 170,000,000 |  |  |

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- Definition Investments which are intended to be sold in the short term (usually less than one year or the normal operating cycle, whichever is longer) including trading securities, available-for-sale securities, held-to-maturity securities, and other short-term investments not otherwise listed in the existing taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Subparagraph g -Article 7 + Details
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