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Segment Information (Schedule Of Segment Reporting Information) (Details) - USD ($) $ in Millions | 4 Months Ended | 8 Months Ended | 12 Months Ended
--- | --- | --- | ---
Apr. 30, 2021 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Segment Reporting Information [Line Items] |  |  |  |
Revenues | $ 397.4 | $ 835.0 | $ 1,427.2 | $ 2,053.2
Operating expenses - Contract drilling (exclusive of depreciation) | 343.8 | 728.7 | 1,470.4 | 1,807.8
Asset Impairment Charges | 756.5 | 0.0 | 3,646.2 | 104.0
Debtor in possession financing fees and payments on Backstop Commitment Agreement | 159.6 | 66.1 | 540.8 | 609.7
General and administrative | 30.7 | 58.2 | 214.6 | 188.9
Income (Loss) from Equity Method Investments | (3.1) | (6.1) | 7.8 | 12.6
OPERATING LOSS | (890.1) | (11.9) | (4,334.5) | (669.8)
Property and equipment, net | 909.1 | 890.9 | 10,960.5 | 15,096.9
Capital expenditures | 8.7 | 50.2 | 93.8 | 227.0
Other Operating Income | 0.0 | 0.0 | 118.1 | 0.0
Floaters [Member] | Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 115.7 | 254.5 | 505.8 | 1,014.4
Operating expenses - Contract drilling (exclusive of depreciation) | 106.5 | 250.7 | 566.1 | 785.0
Asset Impairment Charges | 756.5 |  | 3,386.2 | 88.2
Debtor in possession financing fees and payments on Backstop Commitment Agreement | 72.1 | 31.0 | 262.8 | 362.3
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) | (3,591.2) | (221.1)
Property and equipment, net | 419.3 | 408.2 | 6,413.4 | 10,073.1
Capital expenditures | 3.3 | 26.0 | 25.1 | 31.4
Other Operating Income |  |  | 118.1 |
Jackups [Member] | Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 232.4 | 487.1 | 765.3 | 834.6
Operating expenses - Contract drilling (exclusive of depreciation) | 175.0 | 365.2 | 659.5 | 711.3
Asset Impairment Charges | 0.0 |  | 254.3 | 10.2
Debtor in possession financing fees and payments on Backstop Commitment Agreement | 69.7 | 32.0 | 217.2 | 203.3
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 | (365.7) | (90.2)
Property and equipment, net | 401.4 | 401.9 | 3,912.6 | 4,322.7
Capital expenditures | 5.4 | 23.7 | 58.9 | 184.6
Other Operating Income |  |  | 0.0 |
ARO | Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 163.5 | 307.1 | 549.4 | 410.5
Operating expenses - Contract drilling (exclusive of depreciation) | 116.1 | 246.2 | 388.2 | 280.2
Asset Impairment Charges | 0.0 |  | 0.0 | 0.0
Debtor in possession financing fees and payments on Backstop Commitment Agreement | 21.0 | 44.2 | 54.8 | 40.3
General and administrative | 4.2 | 13.6 | 24.2 | 27.1
Income (Loss) from Equity Method Investments | 0.0 | 0.0 | 0.0 | 0.0
OPERATING LOSS | 22.2 | 3.1 | 82.2 | 62.9
Property and equipment, net | 730.7 | 730.6 | 736.2 | 650.7
Capital expenditures | 14.9 | 41.8 | 136.1 | 27.5
Other Operating Income |  |  | 0.0 |
Other [Member] | Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 49.3 | 93.4 | 156.1 | 204.2
Operating expenses - Contract drilling (exclusive of depreciation) | 19.9 | 38.9 | 82.8 | 111.0
Asset Impairment Charges | 0.0 |  | 5.7 | 0.0
Debtor in possession financing fees and payments on Backstop Commitment Agreement | 14.8 | 2.8 | 44.8 | 25.5
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 | 22.8 | 67.7
Property and equipment, net | 50.5 | 46.0 | 577.9 | 620.9
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) | (549.4) | (410.5)
Operating expenses - Contract drilling (exclusive of depreciation) | (73.7) | (172.3) | (226.2) | (79.7)
Asset Impairment Charges | 0.0 |  | 0.0 | 5.6
Debtor in possession financing fees and payments on Backstop Commitment Agreement | (18.0) | (43.9) | (38.8) | (21.7)
General and administrative | 26.5 | 44.6 | 190.4 | 161.8
Income (Loss) from Equity Method Investments | (3.1) | (6.1) | 7.8 | 12.6
OPERATING LOSS | (95.2) | (129.4) | (482.6) | (489.1)
Property and equipment, net | (692.8) | (695.8) | (679.6) | (570.5)
Capital expenditures | $ (14.9) | $ (41.3) | (126.3) | $ (16.5)
Other Operating Income |  |  | $ 0.0 |

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