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Segment Information (Schedule Of Segment Reporting Information) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Segment Reporting Information [Line Items]      
Revenues $ 2,362.6 $ 1,784.2 $ 1,602.5
Contract Drilling Expenses Exclusive of Depreciation and Reimbursable Expenses 1,618.5 1,440.4 1,283.7
Reimbursable Expenses 142.4 103.2 99.5
Cost of Goods and Services Sold 1,760.9 1,543.6 1,383.2
Loss on impairment 0.0 0.0 34.5
Depreciation 122.1 101.1 91.2
General and administrative 116.3 99.3 80.9
Income (Loss) from Equity Method Investments 11.0 (13.3) (24.5)
OPERATING LOSS 352.3 53.5 37.2
Property and equipment, net 1,932.9 1,633.8 977.2
Segment, Expenditure, Addition to Long-Lived Assets 455.1 696.1 207.0
Revenues Excluding Reimbursable Revenues 2,211.9 1,676.0 1,497.3
Reimbursable Revenues 150.7 108.2 105.2
Floaters [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Revenues 1,440.7 948.7 700.5
Contract Drilling Expenses Exclusive of Depreciation and Reimbursable Expenses 930.3 768.4 598.3
Reimbursable Expenses 54.9 43.6 47.7
Cost of Goods and Services Sold 985.2 812.0 646.0
Loss on impairment 0.0   34.5
Depreciation 58.1 55.8 50.0
General and administrative 0.0 0.0 0.0
Income (Loss) from Equity Method Investments 0.0 0.0 0.0
OPERATING LOSS 397.4 80.9 (30.0)
Property and equipment, net 1,174.2 1,035.5 487.5
Segment, Expenditure, Addition to Long-Lived Assets 239.7 562.0 152.9
Revenues Excluding Reimbursable Revenues 1,382.8 902.8 649.3
Reimbursable Revenues 57.9 45.9 51.2
Jackups [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Revenues 754.9 659.6 744.2
Contract Drilling Expenses Exclusive of Depreciation and Reimbursable Expenses 477.1 480.4 509.4
Reimbursable Expenses 64.3 37.0 29.5
Cost of Goods and Services Sold 541.4 517.4 538.9
Loss on impairment 0.0   0.0
Depreciation 45.0 40.0 36.1
General and administrative 0.0 0.0 0.0
Income (Loss) from Equity Method Investments 0.0 0.0 0.0
OPERATING LOSS 168.5 102.2 169.2
Property and equipment, net 575.3 480.8 391.7
Segment, Expenditure, Addition to Long-Lived Assets 213.1 132.3 53.5
Revenues Excluding Reimbursable Revenues 686.5 620.6 713.4
Reimbursable Revenues 68.4 39.0 30.8
ARO | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Revenues 512.5 496.6 459.5
Contract Drilling Expenses Exclusive of Depreciation and Reimbursable Expenses 367.7 365.9 341.8
Reimbursable Expenses 0.0 0.0 0.0
Cost of Goods and Services Sold 367.7 365.9 341.8
Loss on impairment 28.4   0.0
Depreciation 89.2 65.9 63.4
General and administrative 23.7 22.2 18.7
Income (Loss) from Equity Method Investments 0.0 0.0 0.0
OPERATING LOSS 3.5 42.6 35.6
Property and equipment, net 1,253.1 1,036.6 775.6
Segment, Expenditure, Addition to Long-Lived Assets 285.0 300.8 103.7
Revenues Excluding Reimbursable Revenues 512.5 496.6 459.5
Reimbursable Revenues 0.0 0.0 0.0
Other [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Revenues 167.0 175.9 157.8
Contract Drilling Expenses Exclusive of Depreciation and Reimbursable Expenses 63.6 52.6 54.1
Reimbursable Expenses 23.2 22.6 22.3
Cost of Goods and Services Sold 86.8 75.2 76.4
Loss on impairment 0.0   0.0
Depreciation 9.5 5.0 4.6
General and administrative 0.0 0.0 0.0
Income (Loss) from Equity Method Investments 0.0 0.0 0.0
OPERATING LOSS 70.7 95.7 76.8
Property and equipment, net 132.8 52.1 56.8
Segment, Expenditure, Addition to Long-Lived Assets 0.0 0.0 0.0
Revenues Excluding Reimbursable Revenues 142.6 152.6 134.6
Reimbursable Revenues 24.4 23.3 23.2
Reconciling Items [Member] | Segment Reporting, Reconciling Item, Corporate Nonsegment [Member]      
Segment Reporting Information [Line Items]      
Revenues (512.5) (496.6) (459.5)
Contract Drilling Expenses Exclusive of Depreciation and Reimbursable Expenses (220.2) (226.9) (219.9)
Reimbursable Expenses 0.0 0.0 0.0
Cost of Goods and Services Sold (220.2) (226.9) (219.9)
Loss on impairment (28.4)   0.0
Depreciation (79.7) (65.6) (62.9)
General and administrative 92.6 77.1 62.2
Income (Loss) from Equity Method Investments 11.0 (13.3) (24.5)
OPERATING LOSS (287.8) (267.9) (214.4)
Property and equipment, net (1,202.5) (971.2) (734.4)
Segment, Expenditure, Addition to Long-Lived Assets (282.7) (299.0) (103.1)
Revenues Excluding Reimbursable Revenues (512.5) (496.6) (459.5)
Reimbursable Revenues $ 0.0 $ 0.0 $ 0.0