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Revenue from Contracts with Customers Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disaggregation of Revenue [Line Items] |  |  |
Revenue, Performance Obligation, Description of Timing | The remaining duration of our drilling contracts based on those in place as of December 31, 2019 was between approximately one month and four years. |  |
Capitalized Contract Cost, Net | $ 30.5 |  |
Upfront Rig Mobilizations And Certain Contract Preparation [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Capitalized Contract Cost, Net | 19.7 | $ 23.5 |
Capitalized Contract Cost, Amortization | 42.1 | 34.0 | $ 28.1
Deferred Certification Costs [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Capitalized Contract Cost, Net | 10.8 | 13.6 |
Capitalized Contract Cost, Amortization | $ 10.3 | $ 12.4 | $ 12.1

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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/disclosureRef -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/disclosureRef -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 Description of timing for satisfying performance obligation in contract with customer. Includes, but is not limited to, as services are rendered, and upon shipment, delivery or completion of service. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130554-203045 + Details
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