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Revenue Recognition - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Capitalized Contract Cost [Line Items] |  |  |
Capitalized contract cost | $ 59.1 |  |
Upfront Rig Mobilizations And Certain Contract Preparation |  |  |
Capitalized Contract Cost [Line Items] |  |  |
Capitalized contract cost | 44.5 |  | $ 40.6
Amortization of capitalized contract cost | 6.8 | $ 6.6 |
Deferred Certification Costs |  |  |
Capitalized Contract Cost [Line Items] |  |  |
Capitalized contract cost | 14.6 |  | $ 15.3
Amortization of capitalized contract cost | $ 3.1 | $ 3.1 |

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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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