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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

X

- 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

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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://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

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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

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