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Derivative Instruments (Gains And Losses On Derivatives Designated As Cash Flow Hedges) (Details) - USD ($) | 4 Months Ended | 8 Months Ended | 12 Months Ended
--- | --- | --- | ---
Apr. 30, 2021 | Dec. 31, 2021 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Derivative [Line Items] |  |  |  |  |
Net change in fair value of derivatives | $ 0 | $ 0 | $ 0 |  | $ (5,400,000)
Derivative Instrument, Gain (Loss) Reclassified from AOCI into Income, Effective Portion, Statement of Income or Comprehensive Income [Extensible Enumeration] |  |  |  | Asset Impairment Charges |
Foreign Currency Forward Contracts [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Gain (Loss) Reclassified from AOCI into Income (Effective Portion) | 5,600,000 |  |  |  |
Cash Flow Hedges [Member] | Foreign Currency Forward Contracts [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Gain (Loss) Reclassified from AOCI into Income (Effective Portion) | (5,600,000) | 0 |  |  | (11,600,000)
Net change in fair value of derivatives | $ 0 | $ 0 |  |  | (5,400,000)
Contract Drilling [Member] | Foreign Currency Forward Contracts [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Gain (Loss) Reclassified from AOCI into Income (Effective Portion) |  |  |  |  | (2,000,000)
Depreciation Expense [Member] | Foreign Currency Forward Contracts [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Gain (Loss) Reclassified from AOCI into Income (Effective Portion) |  |  |  |  | $ 13,600,000

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- Definition Indicates line item in statement of income or comprehensive income that includes gain (loss) from effective portion of derivative instrument reclassified from accumulated other comprehensive income (AOCI) into income. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4D -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5624177-113959 + Details
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- Definition The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4D -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5624177-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5624171-113959 + Details
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- Definition Amount, after tax and before reclassification, of gain (loss) from derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=126968391&loc=SL7669646-108580 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI https://asc.fasb.org/extlink&oid=126968391&loc=d3e637-108580 + Details
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