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Segment Information (Schedule Of Segment Reporting Information) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Segment Reporting Information [Line Items]          
Revenues $ 415.2 $ 413.3 $ 845.3 $ 731.7  
Operating expenses          
Cost of Goods and Services Sold 373.5 361.8 750.7 693.1  
Loss on impairment 0.0 34.5 0.0 34.5  
Depreciation expense 24.5 22.3 47.8 44.8  
General and administrative 26.4 19.0 50.8 37.8  
Income (Loss) from Equity Method Investments 0.7 (8.7) (2.6) (13.0)  
Operating Income (Loss) (9.9) (15.6) (1.4) (65.5)  
Property, Plant and Equipment, Net (1,073.7) (931.7) (1,073.7) (931.7) $ (977.2)
Operating Segments [Member] | Floaters          
Segment Reporting Information [Line Items]          
Revenues 227.4 188.1 442.2 287.8  
Operating expenses          
Cost of Goods and Services Sold 196.2 165.3 370.8 312.9  
Loss on impairment   34.5   34.5  
Depreciation expense 13.6 12.3 26.6 24.5  
General and administrative 0.0 0.0 0.0 0.0  
Income (Loss) from Equity Method Investments 0.0 0.0 0.0 0.0  
Operating Income (Loss) 17.6 (24.0) 44.8 (84.1)  
Property, Plant and Equipment, Net (552.3) (462.9) (552.3) (462.9)  
Operating Segments [Member] | Jackups          
Segment Reporting Information [Line Items]          
Revenues 144.6 185.8 314.4 366.5  
Operating expenses          
Cost of Goods and Services Sold 123.5 142.2 272.4 281.4  
Loss on impairment   0.0   0.0  
Depreciation expense 9.6 8.7 18.6 17.8  
General and administrative 0.0 0.0 0.0 0.0  
Income (Loss) from Equity Method Investments 0.0 0.0 0.0 0.0  
Operating Income (Loss) 11.5 34.9 23.4 67.3  
Property, Plant and Equipment, Net (418.4) (384.8) (418.4) (384.8)  
Operating Segments [Member] | ARO          
Segment Reporting Information [Line Items]          
Revenues 117.8 116.4 241.4 227.7  
Operating expenses          
Cost of Goods and Services Sold 95.0 82.1 185.9 166.3  
Loss on impairment   0.0   0.0  
Depreciation expense 15.6 15.4 30.6 31.9  
General and administrative 5.7 3.2 10.3 8.4  
Income (Loss) from Equity Method Investments 0.0 0.0 0.0 0.0  
Operating Income (Loss) 1.5 15.7 14.6 21.1  
Property, Plant and Equipment, Net (838.8) (733.4) (838.8) (733.4)  
Operating Segments [Member] | Other          
Segment Reporting Information [Line Items]          
Revenues 43.2 39.4 88.7 77.4  
Operating expenses          
Cost of Goods and Services Sold 18.2 24.7 38.4 40.2  
Loss on impairment   0.0   0.0  
Depreciation expense 1.2 1.3 2.5 2.2  
General and administrative 0.0 0.0 0.0 0.0  
Income (Loss) from Equity Method Investments 0.0 0.0 0.0 0.0  
Operating Income (Loss) 23.8 13.4 47.8 35.0  
Property, Plant and Equipment, Net (54.5) (50.4) (54.5) (50.4)  
Corporate, Non-Segment [Member] | Reconciling Items          
Segment Reporting Information [Line Items]          
Revenues (117.8) (116.4) (241.4) (227.7)  
Operating expenses          
Cost of Goods and Services Sold (59.4) (52.5) (116.8) (107.7)  
Loss on impairment   0.0   0.0  
Depreciation expense (15.5) (15.4) (30.5) (31.6)  
General and administrative 20.7 15.8 40.5 29.4  
Income (Loss) from Equity Method Investments 0.7 (8.7) (2.6) (13.0)  
Operating Income (Loss) (64.3) (55.6) (132.0) (104.8)  
Property, Plant and Equipment, Net $ 790.3 $ 699.8 $ 790.3 $ 699.8