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Segment Information (Schedule Of Segment Reporting Information) (Details) - USD ($) $ in Millions | 3 Months Ended | 4 Months Ended | 8 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Sep. 30, 2022 | Jun. 30, 2022 | Jun. 30, 2021 | Apr. 30, 2021 | Dec. 31, 2021 | Dec. 31, 2022 | Dec. 31, 2020
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Revenues |  |  |  | $ 397.4 | $ 835.0 | $ 1,602.5 | $ 1,427.2
Operating expenses - Contract drilling (exclusive of depreciation) |  |  |  | 343.8 | 724.1 | 1,383.2 | 1,470.4
Asset Impairment Charges | $ 34.5 | $ 34.5 | $ 5.6 | 756.5 | 0.0 | 34.5 | 3,646.2
Debtor in possession financing fees and payments on Backstop Commitment Agreement |  |  |  | 159.6 | 66.1 | 91.2 | 540.8
General and administrative |  |  |  | 30.7 | 58.2 | 80.9 | 214.6
Income (Loss) from Equity Method Investments |  |  |  | (3.1) | (6.1) | (24.5) | 7.8
OPERATING LOSS |  |  |  | (890.1) | (7.3) | 37.2 | (4,334.5)
Property and equipment, net |  |  |  | 909.1 | 890.9 | 977.2 | 10,960.5
Capital expenditures |  |  |  | 8.7 | 50.2 | 207.0 | 93.8
Other Operating Income |  |  |  | 0.0 | 0.0 | 0.0 | 118.1
Floaters [Member] | Operating Segments [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Revenues |  |  |  | 115.7 | 254.5 | 700.5 | 505.8
Operating expenses - Contract drilling (exclusive of depreciation) |  |  |  | 106.5 | 250.7 | 646.0 | 566.1
Asset Impairment Charges |  |  |  | 756.5 |  | 34.5 | 3,386.2
Debtor in possession financing fees and payments on Backstop Commitment Agreement |  |  |  | 72.1 | 31.0 | 50.0 | 262.8
General and administrative |  |  |  | 0.0 | 0.0 | 0.0 | 0.0
Income (Loss) from Equity Method Investments |  |  |  | 0.0 | 0.0 | 0.0 | 0.0
OPERATING LOSS |  |  |  | (819.4) | (27.2) | (30.0) | (3,591.2)
Property and equipment, net |  |  |  | 419.3 | 408.2 | 487.5 | 6,413.4
Capital expenditures |  |  |  | 3.3 | 26.0 | 152.9 | 25.1
Other Operating Income |  |  |  |  |  |  | 118.1
Jackups [Member] | Operating Segments [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Revenues |  |  |  | 232.4 | 487.1 | 744.2 | 765.3
Operating expenses - Contract drilling (exclusive of depreciation) |  |  |  | 175.0 | 365.2 | 538.9 | 659.5
Asset Impairment Charges |  |  |  | 0.0 |  | 0.0 | 254.3
Debtor in possession financing fees and payments on Backstop Commitment Agreement |  |  |  | 69.7 | 32.0 | 36.1 | 217.2
General and administrative |  |  |  | 0.0 | 0.0 | 0.0 | 0.0
Income (Loss) from Equity Method Investments |  |  |  | 0.0 | 0.0 | 0.0 | 0.0
OPERATING LOSS |  |  |  | (12.3) | 89.9 | 169.2 | (365.7)
Property and equipment, net |  |  |  | 401.4 | 401.9 | 391.7 | 3,912.6
Capital expenditures |  |  |  | 5.4 | 23.7 | 53.5 | 58.9
Other Operating Income |  |  |  |  |  |  | 0.0
ARO | Operating Segments [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Revenues |  |  |  | 163.5 | 307.1 | 459.5 | 549.4
Operating expenses - Contract drilling (exclusive of depreciation) |  |  |  | 116.1 | 246.2 | 341.8 | 388.2
Asset Impairment Charges |  |  |  | 0.0 |  | 0.0 | 0.0
Debtor in possession financing fees and payments on Backstop Commitment Agreement |  |  |  | 21.0 | 44.2 | 63.4 | 54.8
General and administrative |  |  |  | 4.2 | 13.6 | 18.7 | 24.2
Income (Loss) from Equity Method Investments |  |  |  | 0.0 | 0.0 | 0.0 | 0.0
OPERATING LOSS |  |  |  | 22.2 | 3.1 | 35.6 | 82.2
Property and equipment, net |  |  |  | 730.7 | 730.6 | 775.6 | 736.2
Capital expenditures |  |  |  | 14.9 | 41.8 | 24.6 | 136.1
Other Operating Income |  |  |  |  |  |  | 0.0
Other [Member] | Operating Segments [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Revenues |  |  |  | 49.3 | 93.4 | 157.8 | 156.1
Operating expenses - Contract drilling (exclusive of depreciation) |  |  |  | 19.9 | 38.9 | 76.4 | 82.8
Asset Impairment Charges |  |  |  | 0.0 |  | 0.0 | 5.7
Debtor in possession financing fees and payments on Backstop Commitment Agreement |  |  |  | 14.8 | 2.8 | 4.6 | 44.8
General and administrative |  |  |  | 0.0 | 0.0 | 0.0 | 0.0
Income (Loss) from Equity Method Investments |  |  |  | 0.0 | 0.0 | 0.0 | 0.0
OPERATING LOSS |  |  |  | 14.6 | 51.7 | 76.8 | 22.8
Property and equipment, net |  |  |  | 50.5 | 46.0 | 56.8 | 577.9
Capital expenditures |  |  |  | 0.0 | 0.0 | 0.0 | 0.0
Other Operating Income |  |  |  |  |  |  | 0.0
Reconciling Items [Member] | Corporate, Non-Segment [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Revenues |  |  |  | (163.5) | (307.1) | (459.5) | (549.4)
Operating expenses - Contract drilling (exclusive of depreciation) |  |  |  | (73.7) | (176.9) | (219.9) | (226.2)
Asset Impairment Charges |  |  |  | 0.0 |  | 0.0 | 0.0
Debtor in possession financing fees and payments on Backstop Commitment Agreement |  |  |  | (18.0) | (43.9) | (62.9) | (38.8)
General and administrative |  |  |  | 26.5 | 44.6 | 62.2 | 190.4
Income (Loss) from Equity Method Investments |  |  |  | (3.1) | (6.1) | (24.5) | 7.8
OPERATING LOSS |  |  |  | (95.2) | (124.8) | (214.4) | (482.6)
Property and equipment, net |  |  |  | (692.8) | (695.8) | (734.4) | (679.6)
Capital expenditures |  |  |  | $ (14.9) | $ (41.3) | $ (24.0) | (126.3)
Other Operating Income |  |  |  |  |  |  | $ 0.0

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