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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

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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
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-URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131252-203054

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