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Revenue from Contracts with Customers (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Upfront Rig Mobilizations And Certain Contract Preparation [Member] |  |  |  |  |
Capitalized Contract Cost [Line Items] |  |  |  |  |
Capitalized Contract Cost, Net | $ 39.2 |  | $ 39.2 |  | $ 40.6
Capitalized Contract Cost, Amortization | 9.1 | $ 8.2 | 15.9 | $ 14.7 |
Deferred Certification Costs |  |  |  |  |
Capitalized Contract Cost [Line Items] |  |  |  |  |
Capitalized Contract Cost, Net | 14.2 |  | 14.2 |  | $ 15.3
Capitalized Contract Cost, Amortization | $ 3.2 | $ 2.8 | $ 6.3 | $ 5.9 |

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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://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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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