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Commitments And Contingencies (Capital Commitments) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Property, Plant and Equipment [Line Items]    
Aggregate Contractual Capital Commitments Due In One Year   $ 0.0
Aggregate Contractual Capital Commitments Due In Two Years   83.9
Aggregate Contractual Capital Commitments Due In Three Years   165.0
Aggregate Contractual Capital Commitments Due Thereafter   0.0
Total   248.9
Holding Costs   23.0
Milestone Payment   313.3
ENSCO DS-13 [Member]    
Property, Plant and Equipment [Line Items]    
Aggregate Contractual Capital Commitments Due In One Year   0.0
Aggregate Contractual Capital Commitments Due In Two Years   83.9
Aggregate Contractual Capital Commitments Due In Three Years   0.0
Aggregate Contractual Capital Commitments Due Thereafter   0.0
Total   83.9
ENSCO DS-14 [Member]    
Property, Plant and Equipment [Line Items]    
Aggregate Contractual Capital Commitments Due In Two Years   0.0
Aggregate Contractual Capital Commitments Due In Three Years   165.0
Aggregate Contractual Capital Commitments Due Thereafter   0.0
Total   $ 165.0
Forecast [Member]    
Property, Plant and Equipment [Line Items]    
Projected Capital Expenditures $ 160.0