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Segment Information (Schedule Of Segment Reporting Information) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Segment Reporting Information [Line Items]          
Revenues $ 643.1 $ 455.1 $ 1,778.2 $ 1,300.4  
Operating expenses          
Contract drilling (exclusive of depreciation) 462.1 390.9 1,345.6 1,141.6  
Asset Impairment Charges 0.0   0.0    
Depreciation expense 31.7 25.8 88.2 73.6  
General and administrative 30.6 24.2 89.6 75.0  
Income (Loss) from Equity Method Investments 23.8 (2.4) 21.7 (5.0)  
Operating Income (Loss) 94.9 16.6 233.1 15.2  
Property, Plant and Equipment, Net (1,842.7) (1,159.9) (1,842.7) (1,159.9) $ (1,633.8)
Operating Segments [Member] | Floaters          
Segment Reporting Information [Line Items]          
Revenues 389.0 243.3 1,097.3 685.5  
Operating expenses          
Contract drilling (exclusive of depreciation) 247.7 215.2 758.5 586.0  
Asset Impairment Charges 0.0   0.0    
Depreciation expense 14.8 14.2 42.1 40.8  
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) 126.5 13.9 296.7 58.7  
Property, Plant and Equipment, Net (1,131.5) (609.1) (1,131.5) (609.1)  
Operating Segments [Member] | Jackups          
Segment Reporting Information [Line Items]          
Revenues 213.7 165.9 551.8 480.3  
Operating expenses          
Contract drilling (exclusive of depreciation) 156.7 121.7 413.8 394.1  
Asset Impairment Charges 0.0   0.0    
Depreciation expense 11.4 10.2 32.7 28.8  
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) 45.6 34.0 105.3 57.4  
Property, Plant and Equipment, Net (500.6) (443.0) (500.6) (443.0)  
Operating Segments [Member] | ARO          
Segment Reporting Information [Line Items]          
Revenues 113.7 121.5 376.2 362.9  
Operating expenses          
Contract drilling (exclusive of depreciation) 93.8 92.0 286.2 277.9  
Asset Impairment Charges 28.4   28.4    
Depreciation expense 21.1 15.8 59.8 46.4  
General and administrative 4.9 5.6 16.2 15.9  
Income (Loss) from Equity Method Investments 0.0 0.0 0.0 0.0  
Operating Income (Loss) (34.5) 8.1 (14.4) 22.7  
Property, Plant and Equipment, Net (1,186.0) (873.4) (1,186.0) (873.4)  
Operating Segments [Member] | Other          
Segment Reporting Information [Line Items]          
Revenues 40.4 45.9 129.1 134.6  
Operating expenses          
Contract drilling (exclusive of depreciation) 22.1 18.8 63.9 57.2  
Asset Impairment Charges 0.0   0.0    
Depreciation expense 2.9 1.3 6.7 3.8  
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) 15.4 25.8 58.5 73.6  
Property, Plant and Equipment, Net (135.2) (53.3) (135.2) (53.3)  
Corporate, Non-Segment [Member] | Reconciling Items          
Segment Reporting Information [Line Items]          
Revenues (113.7) (121.5) (376.2) (362.9)  
Operating expenses          
Contract drilling (exclusive of depreciation) (58.2) (56.8) (176.8) (173.6)  
Asset Impairment Charges (28.4)   (28.4)    
Depreciation expense (18.5) (15.7) (53.1) (46.2)  
General and administrative 25.7 18.6 73.4 59.1  
Income (Loss) from Equity Method Investments 23.8 (2.4) 21.7 (5.0)  
Operating Income (Loss) (58.1) (65.2) (213.0) (197.2)  
Property, Plant and Equipment, Net $ 1,110.6 $ 818.9 $ 1,110.6 $ 818.9