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Commitments And Contingencies (Capital Commitments) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Mar. 31, 2018
Property, Plant and Equipment [Line Items]    
Document Period End Date Dec. 31, 2018  
Cumulative Paid [1] $ 291.4  
Aggregate Contractual Capital Commitments Due In One Year 92.9  
Aggregate Contractual Capital Commitments Due In Two Years 165.0  
Aggregate Contractual Capital Commitments Due Thereafter 0.0  
Total [2] 549.3  
ENSCO 123 [Member]    
Property, Plant and Equipment [Line Items]    
Cumulative Paid [1] 276.4  
Aggregate Contractual Capital Commitments Due In One Year 9.0  
Aggregate Contractual Capital Commitments Due In Two Years 0.0  
Aggregate Contractual Capital Commitments Due Thereafter 0.0  
Total [2] 285.4  
Aggregate Contractual Capital Commitments Paid   $ 207.4
ENSCO DS-14 [Member]    
Property, Plant and Equipment [Line Items]    
Cumulative Paid [1] 15.0  
Aggregate Contractual Capital Commitments Due In One Year 0.0  
Aggregate Contractual Capital Commitments Due In Two Years 165.0  
Aggregate Contractual Capital Commitments Due Thereafter 0.0  
Total [2] 180.0  
ENSCO DS-13 [Member]    
Property, Plant and Equipment [Line Items]    
Cumulative Paid [1] 0.0  
Aggregate Contractual Capital Commitments Due In One Year 83.9  
Aggregate Contractual Capital Commitments Due In Two Years 0.0  
Aggregate Contractual Capital Commitments Due Thereafter 0.0  
Total [2] $ 83.9  
[1] Cumulative paid represents the aggregate amount of contractual payments made from commencement of the construction agreement through December 31, 2018. Contractual payments made by Atwood prior to the Atwood Merger for ENSCO DS-13 and ENSCO DS-14 are excluded.
[2] Total commitments are based on fixed-price shipyard construction contracts, exclusive of our internal costs associated with project management, commissioning and systems integration testing. Total commitments also exclude holding costs and interest.