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Equity Method Investment in ARO Equity Method Investment In ARO Narrative (Details) $ in Millions | 3 Months Ended | 4 Months Ended | 8 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Sep. 30, 2022 USD ($) | Apr. 30, 2021 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2022 jackup | Dec. 31, 2022 drillship | Dec. 31, 2022
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Number of Rigs Owned by ARO | drillship |  |  |  |  |  |  | 7 |
Number of jackups leased by ARO |  |  |  |  |  | 8 | 8 |
ARO Rigs Under Construction | drillship |  |  |  |  |  |  | 2 |
Contract terms on purchased rigs |  |  |  | 15 years |  |  |  |
Number of newbuild jackup rigs | jackup |  |  |  |  |  | 20 |  |
Order Period |  |  |  | 10 years |  |  |  |
Minimum renewal contract terms for newbuild rigs |  |  |  | 8 years |  |  |  |
Accounts receivable |  |  | $ 12.1 | $ 12.0 |  |  |  |
Non-cash amortization |  | $ 0.0 | 20.8 | 44.9 | $ 0.0 |  |  |
Cost of ARO newbuild jackups, each |  |  |  | $ 176.0 |  |  |  |
Equity Method Investment Summarized Financial Information Non Cash Interest Income | $ 14.8 |  |  |  |  |  |  |
Shareholder Notes Payable, Term |  |  |  | 10 years |  |  |  |
ARO |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Interest income |  | 3.5 | 27.8 | $ 56.2 | 18.3 |  |  |
Non-cash amortization |  | $ 0.0 | 20.8 | 44.9 | $ 0.0 |  |  |
Early Repayment of Principal from Joint Venture Non Current | $ 40.0 |  |  |  |  |  |  |
ARO |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Accounts payable |  |  | 38.3 | 43.2 |  |  |  |
Ownership percentage |  |  |  |  |  |  |  | 50.00%
Equity Method Investment Summarized Financial Information Contract Liabilities |  |  | $ 10.8 | $ 16.7 |  |  |  |
Notes Receivable | LIBOR |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  | 2.00% |  |  |  |

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