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Revenue from Contracts with Customers (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Capitalized Contract Cost [Line Items] |  |  |  |  |
Document Period End Date |  |  | Sep. 30, 2018 |  |
Upfront Rig Mobilizations And Certain Contract Preparation [Member] |  |  |  |  |
Capitalized Contract Cost [Line Items] |  |  |  |  |
Capitalized Contract Cost, Net | $ 29.0 |  | $ 29.0 |  | $ 40.6
Capitalized Contract Cost, Amortization | 10.1 | $ 7.1 | 26.0 | $ 21.8 |
Deferred Certification Costs |  |  |  |  |
Capitalized Contract Cost [Line Items] |  |  |  |  |
Capitalized Contract Cost, Net | 13.0 |  | 13.0 |  | $ 15.3
Capitalized Contract Cost, Amortization | $ 3.3 | $ 3.3 | $ 9.6 | $ 9.1 |
Minimum [Member] |  |  |  |  |
Capitalized Contract Cost [Line Items] |  |  |  |  |
Remaining duration of drilling contracts | 1 month |  | 1 month |  |
Maximum [Member] |  |  |  |  |
Capitalized Contract Cost [Line Items] |  |  |  |  |
Remaining duration of drilling contracts | 4 years |  | 4 years |  |

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- Definition The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented. If there is no historical data in the report, use the filing date. The format of the date is CCYY-MM-DD. + References No definition available. + Details
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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 Period in which remaining performance obligation is expected to be recognized as revenue, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130556-203045 + Details
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