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Segment Information (Schedule Of Segment Reporting Information) (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2020
USD ($)
contract
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Segment Reporting Information [Line Items]      
Number of drilling management contracts | contract 2    
Revenues $ 1,427.2 $ 2,053.2 $ 1,705.4
Operating expenses - Contract drilling (exclusive of depreciation) 1,458.6 1,806.0 1,319.4
Asset Impairment Charges 3,646.2 104.0 40.3
Depreciation expense 540.8 609.7 478.9
General and administrative 214.6 188.9 102.7
Income (Loss) from Equity Method Investments 7.8 12.6 0.0
OPERATING LOSS (4,322.7) (668.0) (235.9)
Property and equipment, net 10,960.5 15,096.9 12,616.2
Capital expenditures 93.8 227.0 426.7
Other Operating Income 118.1 0.0 0.0
Floaters [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Revenues 505.8 1,014.4 1,013.5
Operating expenses - Contract drilling (exclusive of depreciation) 633.9 898.6 737.4
Asset Impairment Charges 3,386.2 88.2 0.0
Depreciation expense 262.8 362.3 311.8
General and administrative 0.0 0.0 0.0
Income (Loss) from Equity Method Investments 0.0 0.0  
OPERATING LOSS (3,659.0) (334.7) (35.7)
Property and equipment, net 6,413.4 10,073.1 9,465.6
Capital expenditures 25.1 31.4 105.5
Other Operating Income 118.1    
Jackups [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Revenues 765.3 834.6 630.9
Operating expenses - Contract drilling (exclusive of depreciation) 733.3 788.9 526.5
Asset Impairment Charges 254.3 10.2 40.3
Depreciation expense 217.2 203.3 153.3
General and administrative 0.0 0.0 0.0
Income (Loss) from Equity Method Investments 0.0 0.0  
OPERATING LOSS (439.5) (167.8) (89.2)
Property and equipment, net 3,912.6 4,322.7 3,114.1
Capital expenditures 58.9 184.6 317.7
Other Operating Income 0.0    
ARO | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Revenues 549.4 410.5 0.0
Operating expenses - Contract drilling (exclusive of depreciation) 388.2 280.2 0.0
Asset Impairment Charges 0.0 0.0 0.0
Depreciation expense 54.8 40.3 0.0
General and administrative 24.2 27.1 0.0
Income (Loss) from Equity Method Investments 0.0 0.0  
OPERATING LOSS 82.2 62.9 0.0
Property and equipment, net 736.2 650.7 0.0
Capital expenditures 136.1 27.5 0.0
Other Operating Income 0.0    
Other [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Revenues 156.1 204.2 61.0
Operating expenses - Contract drilling (exclusive of depreciation) 91.4 118.5 55.5
Asset Impairment Charges 5.7 0.0 0.0
Depreciation expense 44.8 25.5 0.0
General and administrative 0.0 0.0 0.0
Income (Loss) from Equity Method Investments 0.0 0.0  
OPERATING LOSS 14.2 60.2 5.5
Property and equipment, net 577.9 620.9 0.0
Capital expenditures 0.0 0.0 0.0
Other Operating Income 0.0    
Reconciling Items [Member] | Corporate, Non-Segment [Member]      
Segment Reporting Information [Line Items]      
Revenues (549.4) (410.5) 0.0
Operating expenses - Contract drilling (exclusive of depreciation) (388.2) (280.2) 0.0
Asset Impairment Charges 0.0 5.6 0.0
Depreciation expense (38.8) (21.7) 13.8
General and administrative 190.4 161.8 102.7
Income (Loss) from Equity Method Investments 7.8 12.6  
OPERATING LOSS (320.6) (288.6) (116.5)
Property and equipment, net (679.6) (570.5) 36.5
Capital expenditures (126.3) $ (16.5) $ 3.5
Other Operating Income $ 0.0