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Equity Method Investment In ARO Narrative (Details) $ in Millions | 1 Months Ended | 2 Months Ended | 3 Months Ended | 4 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Apr. 30, 2021 USD ($) | Jun. 30, 2021 USD ($) jackup drillship | Jun. 30, 2020 USD ($) | Apr. 30, 2021 USD ($) | Jun. 30, 2021 USD ($) jackup drillship | Jun. 30, 2020 USD ($) | Dec. 31, 2020 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Number of Rigs Owned by ARO | jackup |  | 7 |  |  | 7 |  |
Total Number Of Contract Drilling Rigs |  | 60 |  |  | 60 |  |
Number of jackups leased by ARO | jackup |  | 9 |  |  | 9 |  |
Contracts Terms On Purchased Rigs |  |  |  |  | 15 years |  |
Number of Newbuild Jackup Rigs | jackup |  | 20 |  |  | 20 |  |
Order Period |  |  |  |  | 10 years |  |
ARO Rigs Under Construction | drillship |  | 2 |  |  | 2 |  |
Cost of ARO newbuild jackups, each |  | $ 176.0 |  |  | $ 176.0 |  |
Maximum Contingent Contributions To Joint Venture |  | 1,250.0 |  |  | $ 1,250.0 |  |
Minimum Renewal Contract Terms For NewBuild Rigs |  |  |  |  | 8 years |  |
Equity Method Investment Summarized Financial Information Accounts Receivable |  | 21.0 |  |  | $ 21.0 |  | $ 21.6
Equity Method Investment Summarized Financial Information Accounts Payable |  | 38.6 |  |  | 38.6 |  | 30.9
Due from Joint Ventures, Noncurrent | $ 228.3 | 234.3 |  | $ 228.3 | 234.3 |  | $ 442.7
Equity Method Investment Summarized Financial Information Interest Income | $ 0.9 | 1.7 | $ 4.6 | $ 3.5 |  | $ 9.2 |
Equity Method Investment Summarized Financial Information Interest Receivable |  | $ 5.2 |  |  | $ 5.2 |  |
ARO |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Total Number Of Contract Drilling Rigs | jackup |  | 7 |  |  | 7 |  |
Middle East & Africa |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Total Number Of Contract Drilling Rigs |  | 19 |  |  | 19 |  |
Middle East & Africa | ARO |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Total Number Of Contract Drilling Rigs | jackup |  | 7 |  |  | 7 |  |
Middle East & Africa | Work-in-progress | ARO |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Total Number Of Contract Drilling Rigs | drillship |  | 2 |  |  | 2 |  |
ARO |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  | 50.00% |  |  | 50.00% |  |

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