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Segment Information (Schedule Of Segment Reporting Information) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Segment Reporting Information [Line Items]      
Revenues $ 430.1 $ 318.4  
Operating expenses      
Cost of Goods and Services Sold 377.2 331.3  
Depreciation expense 23.3 22.5  
General and administrative 24.4 18.8  
Income (Loss) from Equity Method Investments (3.3) (4.3)  
Operating Income (Loss) 8.5 (49.9)  
Property, Plant and Equipment, Net (1,015.5) (930.2) $ (977.2)
Operating Segments [Member] | Floaters      
Segment Reporting Information [Line Items]      
Revenues 214.8 99.7  
Operating expenses      
Cost of Goods and Services Sold 174.6 147.6  
Depreciation expense 13.0 12.2  
General and administrative 0.0 0.0  
Income (Loss) from Equity Method Investments 0.0 0.0  
Operating Income (Loss) 27.2 (60.1)  
Property, Plant and Equipment, Net (515.7) (457.6)  
Operating Segments [Member] | Jackups      
Segment Reporting Information [Line Items]      
Revenues 169.8 180.7  
Operating expenses      
Cost of Goods and Services Sold 148.9 139.2  
Depreciation expense 9.0 9.1  
General and administrative 0.0 0.0  
Income (Loss) from Equity Method Investments 0.0 0.0  
Operating Income (Loss) 11.9 32.4  
Property, Plant and Equipment, Net (404.1) (387.1)  
Operating Segments [Member] | ARO      
Segment Reporting Information [Line Items]      
Revenues 123.6 111.3  
Operating expenses      
Cost of Goods and Services Sold 90.9 84.2  
Depreciation expense 15.0 16.5  
General and administrative 4.6 5.2  
Income (Loss) from Equity Method Investments 0.0 0.0  
Operating Income (Loss) 13.1 5.4  
Property, Plant and Equipment, Net (788.6) (730.9)  
Operating Segments [Member] | Other      
Segment Reporting Information [Line Items]      
Revenues 45.5 38.0  
Operating expenses      
Cost of Goods and Services Sold 20.2 15.5  
Depreciation expense 1.3 0.9  
General and administrative 0.0 0.0  
Income (Loss) from Equity Method Investments 0.0 0.0  
Operating Income (Loss) 24.0 21.6  
Property, Plant and Equipment, Net (55.6) (51.7)  
Corporate, Non-Segment [Member] | Reconciling Items      
Segment Reporting Information [Line Items]      
Revenues (123.6) (111.3)  
Operating expenses      
Cost of Goods and Services Sold (57.4) (55.2)  
Depreciation expense (15.0) (16.2)  
General and administrative 19.8 13.6  
Income (Loss) from Equity Method Investments (3.3) (4.3)  
Operating Income (Loss) (67.7) (49.2)  
Property, Plant and Equipment, Net $ 748.5 $ 697.1