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Segment Information (Schedule Of Segment Reporting Information) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Segment Reporting Information [Line Items]      
Revenues $ 525.0 $ 430.1  
Operating expenses      
Contract drilling (exclusive of depreciation) 444.8 377.2  
Depreciation expense 26.8 23.3  
General and administrative 26.5 24.4  
Equity in earnings of ARO (2.4) (3.3)  
Operating Income (Loss) 29.3 8.5  
Property, Plant and Equipment, Net (1,732.3) (1,015.5) $ (1,633.8)
Operating Segments [Member] | Floaters      
Segment Reporting Information [Line Items]      
Revenues 324.4 214.8  
Operating expenses      
Contract drilling (exclusive of depreciation) 253.4 174.6  
Depreciation expense 13.2 13.0  
General and administrative 0.0 0.0  
Equity in earnings of ARO 0.0 0.0  
Operating Income (Loss) 57.8 27.2  
Property, Plant and Equipment, Net (1,080.6) (515.7)  
Operating Segments [Member] | Jackups      
Segment Reporting Information [Line Items]      
Revenues 152.3 169.8  
Operating expenses      
Contract drilling (exclusive of depreciation) 133.9 148.9  
Depreciation expense 10.4 9.0  
General and administrative 0.0 0.0  
Equity in earnings of ARO 0.0 0.0  
Operating Income (Loss) 8.0 11.9  
Property, Plant and Equipment, Net (493.8) (404.1)  
Operating Segments [Member] | ARO      
Segment Reporting Information [Line Items]      
Revenues 138.3 123.6  
Operating expenses      
Contract drilling (exclusive of depreciation) 98.3 90.9  
Depreciation expense 19.0 15.0  
General and administrative 5.8 4.6  
Equity in earnings of ARO 0.0 0.0  
Operating Income (Loss) 15.2 13.1  
Property, Plant and Equipment, Net (1,050.1) (788.6)  
Operating Segments [Member] | Other      
Segment Reporting Information [Line Items]      
Revenues 48.3 45.5  
Operating expenses      
Contract drilling (exclusive of depreciation) 22.2 20.2  
Depreciation expense 1.3 1.3  
General and administrative 0.0 0.0  
Equity in earnings of ARO 0.0 0.0  
Operating Income (Loss) 24.8 24.0  
Property, Plant and Equipment, Net (86.5) (55.6)  
Corporate, Non-Segment [Member] | Reconciling Items      
Segment Reporting Information [Line Items]      
Revenues (138.3) (123.6)  
Operating expenses      
Contract drilling (exclusive of depreciation) (63.0) (57.4)  
Depreciation expense (17.1) (15.0)  
General and administrative 20.7 19.8  
Equity in earnings of ARO (2.4) (3.3)  
Operating Income (Loss) (76.5) (67.7)  
Property, Plant and Equipment, Net $ 978.7 $ 748.5