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Revenue from Contracts with Customers (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Upfront Rig Mobilizations And Certain Contract Preparation [Member] |  |  |  |  |
Capitalized Contract Cost [Line Items] |  |  |  |  |
Capitalized Contract Cost, Net | $ 45.1 |  | $ 45.1 |  | $ 23.5
Capitalized Contract Cost, Amortization | 14.7 | $ 9.1 | 21.1 | $ 15.9 |
Deferred Certification Costs |  |  |  |  |
Capitalized Contract Cost [Line Items] |  |  |  |  |
Capitalized Contract Cost, Net | 12.1 |  | 12.1 |  | $ 13.6
Capitalized Contract Cost, Amortization | $ 2.8 | $ 3.2 | $ 5.7 | $ 6.3 |
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 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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