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Segment Information (Schedule Of Segment Reporting Information) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Segment Reporting Information [Line Items]          
Revenues (exclusive of reimbursable revenues) $ 572.3 $ 572.8 $ 1,150.1 $ 1,064.0  
Reimbursable revenues 42.9 37.3 85.8 71.1  
Total operating revenues 615.2 610.1 1,235.9 1,135.1  
Operating expenses:          
Contract drilling expenses (exclusive of depreciation and reimbursable expenses) 355.2 402.9 729.2 815.4  
Reimbursable expenses 40.5 35.8 81.5 68.1  
Total contract drilling expenses (exclusive of depreciation) 395.7 438.7 810.7 883.5  
Loss on impairment   0.0 7.8 0.0  
Depreciation 35.5 29.7 68.6 56.5  
General and administrative 18.8 32.5 43.2 59.0  
Equity in earnings of ARO 1.1 0.3 (1.5) (2.1)  
OPERATING INCOME 164.1 108.9 307.1 138.2  
Property and equipment, net (2,021.6) (1,809.4) (2,021.6) (1,809.4) $ (1,932.9)
Capital expenditures 67.2 110.2 167.4 261.5  
Operating Segments | Floaters          
Segment Reporting Information [Line Items]          
Revenues (exclusive of reimbursable revenues) 319.7 370.4 675.7 680.2  
Reimbursable revenues 7.2 13.5 16.1 28.1  
Total operating revenues 326.9 383.9 691.8 708.3  
Operating expenses:          
Contract drilling expenses (exclusive of depreciation and reimbursable expenses) 176.3 244.7 380.3 484.3  
Reimbursable expenses 6.7 12.7 15.0 26.5  
Total contract drilling expenses (exclusive of depreciation) 183.0 257.4 395.3 510.8  
Loss on impairment     7.8    
Depreciation 14.6 14.1 28.8 27.3  
General and administrative 0.0 0.0 0.0 0.0  
Equity in earnings of ARO 0.0 0.0 0.0 0.0  
OPERATING INCOME 129.3 112.4 259.9 170.2  
Property and equipment, net (1,183.3) (1,117.3) (1,183.3) (1,117.3)  
Capital expenditures 25.2 50.5 52.2 145.3  
Operating Segments | Jackups          
Segment Reporting Information [Line Items]          
Revenues (exclusive of reimbursable revenues) 212.0 166.8 397.9 306.1  
Reimbursable revenues 26.0 19.0 53.7 32.0  
Total operating revenues 238.0 185.8 451.6 338.1  
Operating expenses:          
Contract drilling expenses (exclusive of depreciation and reimbursable expenses) 124.3 104.7 241.0 226.3  
Reimbursable expenses 24.3 18.5 50.7 30.8  
Total contract drilling expenses (exclusive of depreciation) 148.6 123.2 291.7 257.1  
Loss on impairment     0.0    
Depreciation 14.6 10.9 27.3 21.3  
General and administrative 0.0 0.0 0.0 0.0  
Equity in earnings of ARO 0.0 0.0 0.0 0.0  
OPERATING INCOME 74.8 51.7 132.6 59.7  
Property and equipment, net (643.4) (478.4) (643.4) (478.4)  
Capital expenditures 39.8 59.1 110.0 115.4  
Operating Segments | ARO          
Segment Reporting Information [Line Items]          
Revenues (exclusive of reimbursable revenues) 139.9 124.2 274.6 262.5  
Reimbursable revenues 0.0 0.0 0.0 0.0  
Total operating revenues 139.9 124.2 274.6 262.5  
Operating expenses:          
Contract drilling expenses (exclusive of depreciation and reimbursable expenses) 96.4 94.1 182.0 192.4  
Reimbursable expenses 0.0 0.0 0.0 0.0  
Total contract drilling expenses (exclusive of depreciation) 96.4 94.1 182.0 192.4  
Loss on impairment     0.0    
Depreciation 28.7 19.7 58.2 38.7  
General and administrative 6.6 5.5 12.9 11.3  
Equity in earnings of ARO 0.0 0.0 0.0 0.0  
OPERATING INCOME 8.2 4.9 21.5 20.1  
Property and equipment, net (1,214.9) (1,188.2) (1,214.9) (1,188.2)  
Capital expenditures 14.1 155.5 22.1 185.2  
Operating Segments | Other          
Segment Reporting Information [Line Items]          
Revenues (exclusive of reimbursable revenues) 40.6 35.6 76.5 77.7  
Reimbursable revenues 9.7 4.8 16.0 11.0  
Total operating revenues 50.3 40.4 92.5 88.7  
Operating expenses:          
Contract drilling expenses (exclusive of depreciation and reimbursable expenses) 17.4 15.0 33.4 31.0  
Reimbursable expenses 9.5 4.6 15.8 10.8  
Total contract drilling expenses (exclusive of depreciation) 26.9 19.6 49.2 41.8  
Loss on impairment     0.0    
Depreciation 2.8 2.5 5.6 3.8  
General and administrative 0.0 0.0 0.0 0.0  
Equity in earnings of ARO 0.0 0.0 0.0 0.0  
OPERATING INCOME 20.6 18.3 37.7 43.1  
Property and equipment, net (133.6) (135.4) (133.6) (135.4)  
Capital expenditures 0.0 0.0 0.0 0.0  
Corporate, Non-Segment | Reconciling Items          
Segment Reporting Information [Line Items]          
Revenues (exclusive of reimbursable revenues) (139.9) (124.2) (274.6) (262.5)  
Reimbursable revenues 0.0 0.0 0.0 0.0  
Total operating revenues (139.9) (124.2) (274.6) (262.5)  
Operating expenses:          
Contract drilling expenses (exclusive of depreciation and reimbursable expenses) (59.2) (55.6) (107.5) (118.6)  
Reimbursable expenses 0.0 0.0 0.0 0.0  
Total contract drilling expenses (exclusive of depreciation) (59.2) (55.6) (107.5) (118.6)  
Loss on impairment     0.0    
Depreciation (25.2) (17.5) (51.3) (34.6)  
General and administrative 12.2 27.0 30.3 47.7  
Equity in earnings of ARO 1.1 0.3 (1.5) (2.1)  
OPERATING INCOME (68.8) (78.4) (144.6) (154.9)  
Property and equipment, net 1,153.6 1,109.9 1,153.6 1,109.9  
Capital expenditures $ (11.9) $ (154.9) $ (16.9) $ (184.4)