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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
Jun. 30, 2022
Mar. 31, 2021
Apr. 30, 2021
Dec. 31, 2021
Dec. 31, 2023
Dec. 31, 2022
Segment Reporting Information [Line Items]            
Revenues     $ 397.4 $ 835.0 $ 1,784.2 $ 1,602.5
Cost of Goods and Services Sold     343.8 724.1 1,543.6 1,383.2
Loss on impairment $ 34.5 $ 5.6 756.5 0.0 0.0 34.5
Depreciation     159.6 66.1 101.1 91.2
General and administrative     30.7 58.2 99.3 80.9
Income (Loss) from Equity Method Investments     (3.1) (6.1) (13.3) (24.5)
OPERATING LOSS     (890.1) (7.3) 53.5 37.2
Property and equipment, net     909.1 890.9 1,633.8 977.2
Segment, Expenditure, Addition to Long-Lived Assets     8.7 50.2 696.1 207.0
Floaters [Member] | Operating Segments [Member]            
Segment Reporting Information [Line Items]            
Revenues     115.7 254.5 948.7 700.5
Cost of Goods and Services Sold     106.5 250.7 812.0 646.0
Loss on impairment     756.5     34.5
Depreciation     72.1 31.0 55.8 50.0
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) 80.9 (30.0)
Property and equipment, net     419.3 408.2 1,035.5 487.5
Segment, Expenditure, Addition to Long-Lived Assets     3.3 26.0 562.0 152.9
Jackups [Member] | Operating Segments [Member]            
Segment Reporting Information [Line Items]            
Revenues     232.4 487.1 659.6 744.2
Cost of Goods and Services Sold     175.0 365.2 517.4 538.9
Loss on impairment     0.0     0.0
Depreciation     69.7 32.0 40.0 36.1
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) 89.9 102.2 169.2
Property and equipment, net     401.4 401.9 480.8 391.7
Segment, Expenditure, Addition to Long-Lived Assets     5.4 23.7 132.3 53.5
ARO | Operating Segments [Member]            
Segment Reporting Information [Line Items]            
Revenues     163.5 307.1 496.6 459.5
Cost of Goods and Services Sold     116.1 246.2 365.9 341.8
Loss on impairment     0.0     0.0
Depreciation     21.0 44.2 65.9 63.4
General and administrative     4.2 13.6 22.2 18.7
Income (Loss) from Equity Method Investments     0.0 0.0 0.0 0.0
OPERATING LOSS     22.2 3.1 42.6 35.6
Property and equipment, net     730.7 730.6 1,036.6 775.6
Segment, Expenditure, Addition to Long-Lived Assets     14.9 41.8 300.8 103.7
Other [Member] | Operating Segments [Member]            
Segment Reporting Information [Line Items]            
Revenues     49.3 93.4 175.9 157.8
Cost of Goods and Services Sold     19.9 38.9 75.2 76.4
Loss on impairment     0.0     0.0
Depreciation     14.8 2.8 5.0 4.6
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 95.7 76.8
Property and equipment, net     50.5 46.0 52.1 56.8
Segment, Expenditure, Addition to Long-Lived Assets     0.0 0.0 0.0 0.0
Reconciling Items [Member] | Corporate, Non-Segment [Member]            
Segment Reporting Information [Line Items]            
Revenues     (163.5) (307.1) (496.6) (459.5)
Cost of Goods and Services Sold     (73.7) (176.9) (226.9) (219.9)
Loss on impairment     0.0     0.0
Depreciation     (18.0) (43.9) (65.6) (62.9)
General and administrative     26.5 44.6 77.1 62.2
Income (Loss) from Equity Method Investments     (3.1) (6.1) (13.3) (24.5)
OPERATING LOSS     (95.2) (124.8) (267.9) (214.4)
Property and equipment, net     (692.8) (695.8) (971.2) (734.4)
Segment, Expenditure, Addition to Long-Lived Assets     $ (14.9) $ (41.3) $ (299.0) $ (103.1)