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Segment Information (Schedule Of Segment Reporting Information) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Jun. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Segment Reporting Information [Line Items]            
Revenues $ 455.1 $ 437.2   $ 1,300.4 $ 1,168.9  
Operating expenses            
Cost of Goods and Services Sold 390.9 336.7   1,141.6 1,029.8  
Asset Impairment Charges 0.0 0.0 $ 34.5 0.0 34.5  
Depreciation expense 25.8 22.6   73.6 67.4  
General and Administrative Expense 24.2 19.2   75.0 57.0  
Income (Loss) from Equity Method Investments (2.4) (2.9)   (5.0) (15.9)  
Operating Income (Loss) 16.6 61.6   15.2 (3.9)  
Property, Plant and Equipment, Net (1,159.9) (953.6)   (1,159.9) (953.6) $ (977.2)
Operating Segments [Member] | Floaters            
Segment Reporting Information [Line Items]            
Revenues 243.3 201.7   685.5 489.5  
Operating expenses            
Cost of Goods and Services Sold 215.2 160.5   586.0 473.4  
Asset Impairment Charges         34.5  
Depreciation expense 14.2 12.6   40.8 37.1  
General and Administrative Expense 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) 13.9 28.6   58.7 (55.5)  
Property, Plant and Equipment, Net (609.1) (473.4)   (609.1) (473.4)  
Operating Segments [Member] | Jackups            
Segment Reporting Information [Line Items]            
Revenues 165.9 195.9   480.3 562.4  
Operating expenses            
Cost of Goods and Services Sold 121.7 128.0   394.1 409.4  
Asset Impairment Charges         0.0  
Depreciation expense 10.2 8.7   28.8 26.5  
General and Administrative Expense 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) 34.0 59.2   57.4 126.5  
Property, Plant and Equipment, Net (443.0) (386.7)   (443.0) (386.7)  
Operating Segments [Member] | ARO            
Segment Reporting Information [Line Items]            
Revenues 121.5 111.4   362.9 339.1  
Operating expenses            
Cost of Goods and Services Sold 92.0 90.0   277.9 256.3  
Asset Impairment Charges         0.0  
Depreciation expense 15.8 15.4   46.4 47.3  
General and Administrative Expense 5.6 4.7   15.9 13.1  
Income (Loss) from Equity Method Investments 0.0 0.0   0.0 0.0  
Operating Income (Loss) 8.1 1.3   22.7 22.4  
Property, Plant and Equipment, Net (873.4) (757.7)   (873.4) (757.7)  
Operating Segments [Member] | Other            
Segment Reporting Information [Line Items]            
Revenues 45.9 39.6   134.6 117.0  
Operating expenses            
Cost of Goods and Services Sold 18.8 17.8   57.2 58.0  
Asset Impairment Charges         0.0  
Depreciation expense 1.3 1.2   3.8 3.4  
General and Administrative Expense 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) 25.8 20.6   73.6 55.6  
Property, Plant and Equipment, Net (53.3) (57.7)   (53.3) (57.7)  
Corporate, Non-Segment [Member] | Reconciling Items            
Segment Reporting Information [Line Items]            
Revenues (121.5) (111.4)   (362.9) (339.1)  
Operating expenses            
Cost of Goods and Services Sold (56.8) (59.6)   (173.6) (167.3)  
Asset Impairment Charges         0.0  
Depreciation expense (15.7) (15.3)   (46.2) (46.9)  
General and Administrative Expense 18.6 14.5   59.1 43.9  
Income (Loss) from Equity Method Investments (2.4) (2.9)   (5.0) (15.9)  
Operating Income (Loss) (65.2) (48.1)   (197.2) (152.9)  
Property, Plant and Equipment, Net $ 818.9 $ 721.9   $ 818.9 $ 721.9