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Equity Method Investment in ARO Equity Method Investment In ARO Narrative (Details) $ in Millions | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2019 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2020 drillship | Dec. 31, 2020 jackup | Dec. 31, 2020
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
LONG-TERM NOTES RECEIVABLE FROM ARO | $ 452.9 | $ 442.7 |  |  |
Contract terms on purchased rigs |  | 15 years |  |  |
Number of Rigs Owned by ARO |  |  | 7 | 7 |
Number of jackups leased by ARO |  |  | 9 | 9 |
Number of newbuild jackup rigs | jackup |  |  |  | 20 |
Order Period |  | 10 years |  |  |
Maximum contingent contributions to joint venture |  | $ 1,250.0 |  |  |
Minimum renewal contract terms for newbuild rigs |  | 8 years |  |  |
Accounts receivable | 21.8 | $ 21.6 |  |  |
Accounts payable |  | 0.7 |  |  |
Due from joint ventures |  | 14.2 |  |  |
Interest income | 16.8 | 18.3 |  |  |
Contract with Customer, Liability, Current | 30.0 | 57.6 |  |  |
ARO Rigs Under Construction | drillship |  |  | 2 |  |
Cost of ARO newbuild jackups, each |  | 176.0 |  |  |
Equity Method Investment Summarized Financial Information Interest Receivable | $ 0.0 | 0.0 |  |  |
ARO |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Ownership percentage |  |  |  |  | 50.00%
Defined Benefit Plan, Benefit Obligation, Special and Contractual Termination Benefits |  | $ 10.2 |  |  |
Notes Receivable | LIBOR |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Basis spread on variable rate |  | 2.00% |  |  |

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