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Revenue from Contracts with Customers Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disaggregation of Revenue [Line Items] |  |  |
Revenue, Performance Obligation, Description of Timing | The remaining duration of our drilling contracts based on those in place as of December 31, 2018 was between approximately one month and four years. |  |
Capitalized Contract Cost, Net | $ 37.1 |  |
ENSCO DS-9 [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Gain (Loss) on Contract Termination |  | $ 185.0 |
ENSCO 8503 [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Gain (Loss) on Contract Termination |  |  | $ 20.0
Upfront Rig Mobilizations And Certain Contract Preparation [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Capitalized Contract Cost, Net | 23.5 | 40.6 |
Capitalized Contract Cost, Amortization | 34.0 | 28.1 | 42.5
Deferred Certification Costs [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Capitalized Contract Cost, Net | 13.6 | 15.3 |
Capitalized Contract Cost, Amortization | $ 12.4 | $ 12.1 | $ 16.8

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- Definition Amount of amortization expense for asset recognized from cost incurred to obtain or fulfill contract with customer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131252-203054 + Details
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- Definition Amount, after accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131252-203054 + Details
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- Definition Gain (loss) related to the termination of a contract between the parties. The termination may be due to many causes including early termination of a lease by a lessee, a breach of contract by one party, or a failure to perform. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 + Details
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