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Segment Information (Schedule Of Segment Reporting Information) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Segment Reporting Information [Line Items]          
Revenues (exclusive of reimbursable revenues) $ 555.6 $ 599.9 $ 1,705.7 $ 1,663.9  
Reimbursable revenues 40.1 43.2 125.9 114.3  
Total operating revenues 595.7 643.1 1,831.6 1,778.2  
Operating expenses:          
Contract drilling expenses (exclusive of depreciation and reimbursable expenses) 367.6 422.6 1,096.8 1,238.0  
Reimbursable expenses 38.0 39.5 119.5 107.6  
Total contract drilling expenses (exclusive of depreciation) 405.6 462.1 1,216.3 1,345.6  
Loss on impairment 0.0 0.0 7.8 0.0  
Depreciation 37.1 31.7 105.7 88.2  
General and administrative 26.9 30.6 70.1 89.6  
Equity in losses (earnings) of ARO (4.4) 23.8 (5.9) 21.7  
OPERATING INCOME 130.5 94.9 437.6 233.1  
Property and equipment, net (2,034.4) (1,842.7) (2,034.4) (1,842.7) $ (1,932.9)
Capital expenditures 69.8 81.9 237.2 343.4  
Operating Segments | Floaters          
Segment Reporting Information [Line Items]          
Revenues (exclusive of reimbursable revenues) 293.0 374.9 968.7 1,055.1  
Reimbursable revenues 9.9 14.1 26.0 42.2  
Total operating revenues 302.9 389.0 994.7 1,097.3  
Operating expenses:          
Contract drilling expenses (exclusive of depreciation and reimbursable expenses) 187.7 235.2 568.0 719.5  
Reimbursable expenses 9.4 12.5 24.4 39.0  
Total contract drilling expenses (exclusive of depreciation) 197.1 247.7 592.4 758.5  
Loss on impairment   0.0 7.8 0.0  
Depreciation 15.5 14.8 44.3 42.1  
General and administrative 0.0 0.0 0.0 0.0  
Equity in losses (earnings) of ARO 0.0 0.0 0.0 0.0  
OPERATING INCOME 90.3 126.5 350.2 296.7  
Property and equipment, net (1,201.3) (1,131.5) (1,201.3) (1,131.5)  
Capital expenditures 37.6 40.2 89.8 185.5  
Operating Segments | Jackups          
Segment Reporting Information [Line Items]          
Revenues (exclusive of reimbursable revenues) 216.7 192.6 614.6 498.7  
Reimbursable revenues 20.4 21.1 74.1 53.1  
Total operating revenues 237.1 213.7 688.7 551.8  
Operating expenses:          
Contract drilling expenses (exclusive of depreciation and reimbursable expenses) 124.8 136.9 365.8 363.2  
Reimbursable expenses 18.9 19.8 69.6 50.6  
Total contract drilling expenses (exclusive of depreciation) 143.7 156.7 435.4 413.8  
Loss on impairment   0.0 0.0 0.0  
Depreciation 15.3 11.4 42.6 32.7  
General and administrative 0.0 0.0 0.0 0.0  
Equity in losses (earnings) of ARO 0.0 0.0 0.0 0.0  
OPERATING INCOME 78.1 45.6 210.7 105.3  
Property and equipment, net (628.9) (500.6) (628.9) (500.6)  
Capital expenditures 28.9 41.7 138.9 157.1  
Operating Segments | ARO          
Segment Reporting Information [Line Items]          
Revenues (exclusive of reimbursable revenues) 156.8 113.7 431.4 376.2  
Reimbursable revenues 0.0 0.0 0.0 0.0  
Total operating revenues 156.8 113.7 431.4 376.2  
Operating expenses:          
Contract drilling expenses (exclusive of depreciation and reimbursable expenses) 91.6 93.8 273.6 286.2  
Reimbursable expenses 0.0 0.0 0.0 0.0  
Total contract drilling expenses (exclusive of depreciation) 91.6 93.8 273.6 286.2  
Loss on impairment   28.4 0.0 28.4  
Depreciation 28.4 21.1 86.6 59.8  
General and administrative 5.5 4.9 18.4 16.2  
Equity in losses (earnings) of ARO 0.0 0.0 0.0 0.0  
OPERATING INCOME 31.3 (34.5) 52.8 (14.4)  
Property and equipment, net (1,199.7) (1,186.0) (1,199.7) (1,186.0)  
Capital expenditures 10.9 17.7 33.0 202.9  
Operating Segments | Other          
Segment Reporting Information [Line Items]          
Revenues (exclusive of reimbursable revenues) 45.9 32.4 122.4 110.1  
Reimbursable revenues 9.8 8.0 25.8 19.0  
Total operating revenues 55.7 40.4 148.2 129.1  
Operating expenses:          
Contract drilling expenses (exclusive of depreciation and reimbursable expenses) 16.3 14.9 49.7 45.9  
Reimbursable expenses 9.7 7.2 25.5 18.0  
Total contract drilling expenses (exclusive of depreciation) 26.0 22.1 75.2 63.9  
Loss on impairment   0.0 0.0 0.0  
Depreciation 3.0 2.9 8.6 6.7  
General and administrative 0.0 0.0 0.0 0.0  
Equity in losses (earnings) of ARO 0.0 0.0 0.0 0.0  
OPERATING INCOME 26.7 15.4 64.4 58.5  
Property and equipment, net (145.4) (135.2) (145.4) (135.2)  
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) (156.8) (113.7) (431.4) (376.2)  
Reimbursable revenues 0.0 0.0 0.0 0.0  
Total operating revenues (156.8) (113.7) (431.4) (376.2)  
Operating expenses:          
Contract drilling expenses (exclusive of depreciation and reimbursable expenses) (52.8) (58.2) (160.3) (176.8)  
Reimbursable expenses 0.0 0.0 0.0 0.0  
Total contract drilling expenses (exclusive of depreciation) (52.8) (58.2) (160.3) (176.8)  
Loss on impairment   (28.4) 0.0 (28.4)  
Depreciation (25.1) (18.5) (76.4) (53.1)  
General and administrative 21.4 25.7 51.7 73.4  
Equity in losses (earnings) of ARO (4.4) 23.8 (5.9) 21.7  
OPERATING INCOME (95.9) (58.1) (240.5) (213.0)  
Property and equipment, net 1,140.9 1,110.6 1,140.9 1,110.6  
Capital expenditures $ (7.6) $ (17.7) $ (24.5) $ (202.1)