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Segment Information (Schedule Of Segment Reporting Information) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Segment Reporting Information [Line Items]      
Revenues $ 2,369.0 $ 2,362.6 $ 1,784.2
Contract Drilling Expenses Exclusive of Depreciation and Reimbursable Expenses 1,477.1 1,618.5 1,440.4
Reimbursable Expenses 152.6 142.4 103.2
Cost of Product and Service Sold 1,629.7 1,760.9 1,543.6
Loss on impairment 27.3 0.0 0.0
General and administrative 97.1 116.3 99.3
Income (Loss) from Equity Method Investments (8.4) 11.0 (13.3)
Operating Income (Loss) 477.0 352.3 53.5
Property and equipment, net 2,088.8 1,932.9 1,633.8
Segment, Expenditure, Addition to Long-Lived Assets 343.5 455.1 696.1
Revenues Excluding Reimbursable Revenues 2,207.9 2,211.9 1,676.0
Reimbursable Revenues 161.1 150.7 108.2
Depreciation 146.3 122.1 101.1
Floaters [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Revenues 1,260.6 1,440.7 948.7
Contract Drilling Expenses Exclusive of Depreciation and Reimbursable Expenses 765.6 930.3 768.4
Reimbursable Expenses 34.3 54.9 43.6
Cost of Product and Service Sold 799.9 985.2 812.0
Loss on impairment 23.6 0.0  
General and administrative 0.0 0.0 0.0
Income (Loss) from Equity Method Investments 0.0 0.0 0.0
Operating Income (Loss) 376.6 397.4 80.9
Property and equipment, net 1,225.0 1,174.2 1,035.5
Segment, Expenditure, Addition to Long-Lived Assets 144.7 239.7 562.0
Revenues Excluding Reimbursable Revenues 1,224.1 1,382.8 902.8
Reimbursable Revenues 36.5 57.9 45.9
Depreciation 60.5 58.1 55.8
Jackups [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Revenues 912.8 754.9 659.6
Contract Drilling Expenses Exclusive of Depreciation and Reimbursable Expenses 486.5 477.1 480.4
Reimbursable Expenses 83.5 64.3 37.0
Cost of Product and Service Sold 570.0 541.4 517.4
Loss on impairment 3.7 0.0  
General and administrative 0.0 0.0 0.0
Income (Loss) from Equity Method Investments 0.0 0.0 0.0
Operating Income (Loss) 280.5 168.5 102.2
Property and equipment, net 630.8 575.3 480.8
Segment, Expenditure, Addition to Long-Lived Assets 192.0 213.1 132.3
Revenues Excluding Reimbursable Revenues 823.4 686.5 620.6
Reimbursable Revenues 89.4 68.4 39.0
Depreciation 58.6 45.0 40.0
ARO | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Revenues 571.0 512.5 496.6
Contract Drilling Expenses Exclusive of Depreciation and Reimbursable Expenses 360.7 367.7 365.9
Reimbursable Expenses 0.0 0.0 0.0
Cost of Product and Service Sold 360.7 367.7 365.9
Loss on impairment 0.0 28.4  
General and administrative 28.8 23.7 22.2
Income (Loss) from Equity Method Investments 0.0 0.0 0.0
Operating Income (Loss) 66.6 3.5 42.6
Property and equipment, net 1,236.7 1,253.1 1,036.6
Segment, Expenditure, Addition to Long-Lived Assets 95.6 285.0 300.8
Revenues Excluding Reimbursable Revenues 571.0 512.5 496.6
Reimbursable Revenues 0.0 0.0 0.0
Depreciation 114.9 89.2 65.9
Other [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Revenues 195.6 167.0 175.9
Contract Drilling Expenses Exclusive of Depreciation and Reimbursable Expenses 70.6 63.6 52.6
Reimbursable Expenses 34.8 23.2 22.6
Cost of Product and Service Sold 105.4 86.8 75.2
Loss on impairment 0.0 0.0  
General and administrative 0.0 0.0 0.0
Income (Loss) from Equity Method Investments 0.0 0.0 0.0
Operating Income (Loss) 77.0 70.7 95.7
Property and equipment, net 174.2 132.8 52.1
Segment, Expenditure, Addition to Long-Lived Assets 0.0 0.0 0.0
Revenues Excluding Reimbursable Revenues 160.4 142.6 152.6
Reimbursable Revenues 35.2 24.4 23.3
Depreciation 13.2 9.5 5.0
Reconciling Items [Member] | Segment Reporting, Reconciling Item, Corporate Nonsegment [Member]      
Segment Reporting Information [Line Items]      
Revenues (571.0) (512.5) (496.6)
Contract Drilling Expenses Exclusive of Depreciation and Reimbursable Expenses (206.3) (220.2) (226.9)
Reimbursable Expenses 0.0 0.0 0.0
Cost of Product and Service Sold (206.3) (220.2) (226.9)
Loss on impairment 0.0 (28.4)  
General and administrative 68.3 92.6 77.1
Income (Loss) from Equity Method Investments (8.4) 11.0 (13.3)
Operating Income (Loss) (323.7) (287.8) (267.9)
Property and equipment, net (1,177.9) (1,202.5) (971.2)
Segment, Expenditure, Addition to Long-Lived Assets (88.8) (282.7) (299.0)
Revenues Excluding Reimbursable Revenues (571.0) (512.5) (496.6)
Reimbursable Revenues 0.0 0.0 0.0
Depreciation $ (100.9) $ (79.7) $ (65.6)