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Commitments And Contingencies (Narrative) (Details)
 3 Months Ended 12 Months Ended
Mar. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
drillship
jackup
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Commitments and Contingencies Disclosure [Abstract]        
Decline in Backlog from VALARIS DS-8 Termination   $ 150,000,000    
VALARIS DS-8, Loss Contingency Coverage   602,500    
Other Operating Income   118,100,000 $ 0 $ 0
Loss Contingency, Damages Sought, Value   100,000,000    
Proceeds from Legal Settlements $ 27,500,000 $ 0 200,000,000.0 $ 0
Gain (Loss) Related to Litigation Settlement     $ 20,300,000  
ARO Rigs Under Construction | drillship   2    
Order Period   10 years    
Number of newbuild jackup rigs | jackup   20    
Maximum Capital Contribution to ARO   $ 1,250,000,000    
Letters of Credit Outstanding, Amount   $ 115,100,000