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Segment Information (Schedule Of Segment Reporting Information) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Segment Reporting Information [Line Items]      
Revenues $ 620.7 $ 525.0  
Operating expenses:      
Total contract drilling expenses (exclusive of depreciation) 415.0 444.8  
Loss on impairment 7.8 0.0  
Depreciation expense 33.1 26.8  
General and administrative 24.4 26.5  
Equity in earnings of ARO (2.6) (2.4)  
Operating Income (Loss) 143.0 29.3  
Property, Plant and Equipment, Net (1,977.1) (1,732.3) $ (1,932.9)
Segment, Expenditure, Addition to Long-Lived Assets 100.2 151.3  
Revenues Excluding Reimbursable Revenues 577.8 491.2  
Reimbursable Revenues 42.9 33.8  
Contract Drilling Expenses Exclusive of Depreciation and Reimbursable Expenses 374.0 412.5  
Reimbursable Expenses 41.0 32.3  
Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Revenues 620.7    
Operating expenses:      
Total contract drilling expenses (exclusive of depreciation) 415.0    
Revenues Excluding Reimbursable Revenues 577.8    
Reimbursable Revenues 42.9    
Contract Drilling Expenses Exclusive of Depreciation and Reimbursable Expenses 374.0    
Reimbursable Expenses 41.0    
Operating Segments [Member] | Floaters      
Segment Reporting Information [Line Items]      
Revenues 364.9 324.4  
Operating expenses:      
Total contract drilling expenses (exclusive of depreciation) 212.3 253.4  
Loss on impairment 7.8    
Depreciation expense 14.2 13.2  
General and administrative 0.0 0.0  
Equity in earnings of ARO 0.0 0.0  
Operating Income (Loss) 130.6 57.8  
Property, Plant and Equipment, Net (1,162.3) (1,080.6)  
Segment, Expenditure, Addition to Long-Lived Assets 27.0 94.8  
Revenues Excluding Reimbursable Revenues 356.0 309.8  
Reimbursable Revenues 8.9 14.6  
Contract Drilling Expenses Exclusive of Depreciation and Reimbursable Expenses 204.0 239.6  
Reimbursable Expenses 8.3 13.8  
Operating Segments [Member] | Jackups      
Segment Reporting Information [Line Items]      
Revenues 213.6 152.3  
Operating expenses:      
Total contract drilling expenses (exclusive of depreciation) 143.1 133.9  
Loss on impairment 0.0    
Depreciation expense 12.7 10.4  
General and administrative 0.0 0.0  
Equity in earnings of ARO 0.0 0.0  
Operating Income (Loss) 57.8 8.0  
Property, Plant and Equipment, Net (625.5) (493.8)  
Segment, Expenditure, Addition to Long-Lived Assets 70.2 56.3  
Revenues Excluding Reimbursable Revenues 185.9 139.3  
Reimbursable Revenues 27.7 13.0  
Contract Drilling Expenses Exclusive of Depreciation and Reimbursable Expenses 116.7 121.6  
Reimbursable Expenses 26.4 12.3  
Operating Segments [Member] | ARO      
Segment Reporting Information [Line Items]      
Revenues 134.7 138.3  
Operating expenses:      
Total contract drilling expenses (exclusive of depreciation) 85.6 98.3  
Loss on impairment 0.0    
Depreciation expense 29.5 19.0  
General and administrative 6.3 5.8  
Equity in earnings of ARO 0.0 0.0  
Operating Income (Loss) 13.3 15.2  
Property, Plant and Equipment, Net (1,227.8) (1,050.1)  
Segment, Expenditure, Addition to Long-Lived Assets 8.0 29.7  
Revenues Excluding Reimbursable Revenues 134.7 138.3  
Reimbursable Revenues 0.0 0.0  
Contract Drilling Expenses Exclusive of Depreciation and Reimbursable Expenses 85.6 98.3  
Reimbursable Expenses 0.0 0.0  
Operating Segments [Member] | Other      
Segment Reporting Information [Line Items]      
Revenues 42.2 48.3  
Operating expenses:      
Total contract drilling expenses (exclusive of depreciation) 22.3 22.2  
Loss on impairment 0.0    
Depreciation expense 2.8 1.3  
General and administrative 0.0 0.0  
Equity in earnings of ARO 0.0 0.0  
Operating Income (Loss) 17.1 24.8  
Property, Plant and Equipment, Net (131.6) (86.5)  
Segment, Expenditure, Addition to Long-Lived Assets 0.0 0.0  
Revenues Excluding Reimbursable Revenues 35.9 42.1  
Reimbursable Revenues 6.3 6.2  
Contract Drilling Expenses Exclusive of Depreciation and Reimbursable Expenses 16.0 16.0  
Reimbursable Expenses 6.3 6.2  
Corporate, Non-Segment [Member] | Reconciling Items      
Segment Reporting Information [Line Items]      
Revenues (134.7) (138.3)  
Operating expenses:      
Total contract drilling expenses (exclusive of depreciation) (48.3) (63.0)  
Loss on impairment 0.0    
Depreciation expense (26.1) (17.1)  
General and administrative 18.1 20.7  
Equity in earnings of ARO (2.6) (2.4)  
Operating Income (Loss) (75.8) (76.5)  
Property, Plant and Equipment, Net 1,170.1 978.7  
Segment, Expenditure, Addition to Long-Lived Assets (5.0) (29.5)  
Revenues Excluding Reimbursable Revenues (134.7) (138.3)  
Reimbursable Revenues 0.0 0.0  
Contract Drilling Expenses Exclusive of Depreciation and Reimbursable Expenses (48.3) (63.0)  
Reimbursable Expenses $ 0.0 $ 0.0