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Equity Method Investment In ARO Narrative (Details) $ in Millions | 3 Months Ended | 4 Months Ended | 5 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Sep. 30, 2022 USD ($) jackup drillship | Sep. 30, 2021 USD ($) | Apr. 30, 2021 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2022 USD ($) jackup drillship | Dec. 31, 2021 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Number of Rigs Owned by ARO | jackup | 7 |  |  |  | 7 |
Total Number Of Contract Drilling Rigs | 52 |  |  |  | 52 |
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 |
Minimum Renewal Contract Terms For NewBuild Rigs |  |  |  |  | 8 years |
Equity Method Investment Summarized Financial Information Accounts Receivable | 8.2 |  |  |  | $ 8.2 | $ 12.1
Equity Method Investment Summarized Financial Information Contract Liabilities | 19.1 |  |  |  | 19.1 | 10.8
Equity Method Investment Summarized Financial Information Accounts Payable | 36.3 |  |  |  | 36.3 | 38.3
Principal amount | 246.9 |  |  |  | $ 246.9 | 249.1
Shareholder Notes Payable, Term |  |  |  |  | 10 years |
Non-cash amortization |  |  | $ 0.0 | $ 12.9 | $ 37.8 |
Equity Method Investment Summarized Financial Information Non Cash Interest Income | $ 14.8 |  |  |  |  |
Other |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Total Number Of Contract Drilling Rigs | 8 |  |  |  | 8 |
ARO |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Total Number Of Contract Drilling Rigs | 7 |  |  |  | 7 |
ARO |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Principal amount | $ 402.7 |  |  |  | $ 402.7 | 442.7
Equity Method Investment Summarized Financial Information Interest Income | 25.2 | $ 9.6 | 3.5 | 17.3 | 46.4 |
Equity Method Investment Summarized Financial Information Interest Receivable | 8.6 |  |  |  | 8.6 | $ 0.0
Non-cash amortization | 22.4 | $ 6.9 | $ 0.0 | $ 12.9 | 37.8 |
Early Repayment of Principal from Joint Venture Non Current | $ 40.0 |  |  |  | $ 40.0 |
London Interbank Offered Rate (LIBOR) |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  | 2.00% |
Middle East & Africa |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Total Number Of Contract Drilling Rigs | 17 |  |  |  | 17 |
Middle East & Africa | Other |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Total Number Of Contract Drilling Rigs | 8 |  |  |  | 8 |
Middle East & Africa | ARO |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Total Number Of Contract Drilling Rigs | 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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