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Segment Information (Schedule Of Segment Reporting Information) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Segment Reporting Information [Line Items]      
Revenues $ 307.1 $ 456.6  
Operating Expenses [Abstract]      
Contract drilling (exclusive of depreciation) 252.2 476.0  
Loss on impairment 756.5 2,808.2  
Depreciation expense 122.1 164.5  
General and administrative 24.3 53.4  
Equity in losses (earnings) of ARO (1.9) 6.3  
OPERATING LOSS (846.1) (3,051.8)  
Property, Plant and Equipment, Net (10,083.9) (12,157.2) $ (10,960.5)
Operating Segments [Member] | Floaters      
Segment Reporting Information [Line Items]      
Revenues 97.3 179.6  
Operating Expenses [Abstract]      
Contract drilling (exclusive of depreciation) 98.9 213.9  
Loss on impairment 756.5 2,554.3  
Depreciation expense 56.2 89.4  
General and administrative 0.0 0.0  
Equity in losses (earnings) of ARO 0.0 0.0  
OPERATING LOSS (814.3) (2,678.0)  
Property, Plant and Equipment, Net (5,685.4) (7,442.5)  
Operating Segments [Member] | Jackups      
Segment Reporting Information [Line Items]      
Revenues 172.6 212.8  
Operating Expenses [Abstract]      
Contract drilling (exclusive of depreciation) 135.4 226.1  
Loss on impairment 0.0 253.9  
Depreciation expense 52.4 58.5  
General and administrative 0.0 0.0  
Equity in losses (earnings) of ARO 0.0 0.0  
OPERATING LOSS (15.2) (325.7)  
Property, Plant and Equipment, Net (3,778.9) (4,036.0)  
Operating Segments [Member] | ARO      
Segment Reporting Information [Line Items]      
Revenues 122.7 140.3  
Operating Expenses [Abstract]      
Contract drilling (exclusive of depreciation) 86.3 108.3  
Loss on impairment 0.0 0.0  
Depreciation expense 16.1 13.0  
General and administrative 3.0 8.3  
Equity in losses (earnings) of ARO 0.0 0.0  
OPERATING LOSS 17.3 10.7  
Property, Plant and Equipment, Net (729.2) (740.6)  
Operating Segments [Member] | Other      
Segment Reporting Information [Line Items]      
Revenues 37.2 64.2  
Operating Expenses [Abstract]      
Contract drilling (exclusive of depreciation) 17.9 36.0  
Loss on impairment 0.0 0.0  
Depreciation expense 11.3 11.1  
General and administrative 0.0 0.0  
Equity in losses (earnings) of ARO 0.0 0.0  
OPERATING LOSS 8.0 17.1  
Property, Plant and Equipment, Net (566.3) (610.9)  
Corporate, Non-Segment [Member] | Reconciling Items      
Segment Reporting Information [Line Items]      
Revenues (122.7) (140.3)  
Operating Expenses [Abstract]      
Contract drilling (exclusive of depreciation) (86.3) (108.3)  
Loss on impairment 0.0 0.0  
Depreciation expense (13.9) (7.5)  
General and administrative 21.3 45.1  
Equity in losses (earnings) of ARO (1.9) 6.3  
OPERATING LOSS (41.9) (75.9)  
Property, Plant and Equipment, Net $ 675.9 $ 672.8