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Segment Information (Schedule Of Segment Reporting Information) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Segment Reporting Information [Line Items]          
Revenues $ 610.1 $ 415.2 $ 1,135.1 $ 845.3  
Operating expenses          
Contract drilling (exclusive of depreciation) 438.7 373.5 883.5 750.7  
Depreciation expense 29.7 24.5 56.5 47.8  
General and administrative 32.5 26.4 59.0 50.8  
Income (Loss) from Equity Method Investments 0.3 0.7 (2.1) (2.6)  
Operating Income (Loss) 108.9 (9.9) 138.2 (1.4)  
Property, Plant and Equipment, Net (1,809.4) (1,073.7) (1,809.4) (1,073.7) $ (1,633.8)
Operating Segments [Member] | Floaters          
Segment Reporting Information [Line Items]          
Revenues 383.9 227.4 708.3 442.2  
Operating expenses          
Contract drilling (exclusive of depreciation) 257.4 196.2 510.8 370.8  
Depreciation expense 14.1 13.6 27.3 26.6  
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) 112.4 17.6 170.2 44.8  
Property, Plant and Equipment, Net (1,117.3) (552.3) (1,117.3) (552.3)  
Operating Segments [Member] | Jackups          
Segment Reporting Information [Line Items]          
Revenues 185.8 144.6 338.1 314.4  
Operating expenses          
Contract drilling (exclusive of depreciation) 123.2 123.5 257.1 272.4  
Depreciation expense 10.9 9.6 21.3 18.6  
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) 51.7 11.5 59.7 23.4  
Property, Plant and Equipment, Net (478.4) (418.4) (478.4) (418.4)  
Operating Segments [Member] | ARO          
Segment Reporting Information [Line Items]          
Revenues 124.2 117.8 262.5 241.4  
Operating expenses          
Contract drilling (exclusive of depreciation) 94.1 95.0 192.4 185.9  
Depreciation expense 19.7 15.6 38.7 30.6  
General and administrative 5.5 5.7 11.3 10.3  
Income (Loss) from Equity Method Investments 0.0 0.0 0.0 0.0  
Operating Income (Loss) 4.9 1.5 20.1 14.6  
Property, Plant and Equipment, Net (1,188.2) (838.8) (1,188.2) (838.8)  
Operating Segments [Member] | Other          
Segment Reporting Information [Line Items]          
Revenues 40.4 43.2 88.7 88.7  
Operating expenses          
Contract drilling (exclusive of depreciation) 19.6 18.2 41.8 38.4  
Depreciation expense 2.5 1.2 3.8 2.5  
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) 18.3 23.8 43.1 47.8  
Property, Plant and Equipment, Net (135.4) (54.5) (135.4) (54.5)  
Corporate, Non-Segment [Member] | Reconciling Items          
Segment Reporting Information [Line Items]          
Revenues (124.2) (117.8) (262.5) (241.4)  
Operating expenses          
Contract drilling (exclusive of depreciation) (55.6) (59.4) (118.6) (116.8)  
Depreciation expense (17.5) (15.5) (34.6) (30.5)  
General and administrative 27.0 20.7 47.7 40.5  
Income (Loss) from Equity Method Investments 0.3 0.7 (2.1) (2.6)  
Operating Income (Loss) (78.4) (64.3) (154.9) (132.0)  
Property, Plant and Equipment, Net $ 1,109.9 $ 790.3 $ 1,109.9 $ 790.3