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Commitments And Contingencies (Capital Commitments) (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Property, Plant and Equipment [Line Items]    
Cumulative Paid [1]   $ 67.1
Aggregate Contractual Capital Commitments Due In One Year   317.2
Aggregate Contractual Capital Commitments Due in Three 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]   67.1
Aggregate Contractual Capital Commitments Due In One Year   218.3
Aggregate Contractual Capital Commitments Due In Two Years   10.9
Aggregate Contractual Capital Commitments Due in Three Years   0.0
Aggregate Contractual Capital Commitments Due Thereafter   0.0
Total [2]   285.4
ENSCO DS-14 [Member]    
Property, Plant and Equipment [Line Items]    
Cumulative Paid [1]   0.0
Aggregate Contractual Capital Commitments Due In One Year   15.0
Aggregate Contractual Capital Commitments Due in Three 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 Three Years   0.0
Aggregate Contractual Capital Commitments Due Thereafter   0.0
Total [2]   $ 83.9
Scenario, Forecast | ENSCO 123 [Member]    
Property, Plant and Equipment [Line Items]    
Aggregate Contractual Capital Commitments Paid $ 207.4  
[1] Cumulative paid represents the aggregate amount of contractual payments made from commencement of the construction agreement through December 31, 2017. Contractual payments made by Atwood prior to the Merger for ENSCO DS-13 (formerly Atwood Admiral) and ENSCO DS-14 (formerly Atwood Archer) are excluded.
[2] Total commitments are based on fixed-price shipyard construction contracts, exclusive of costs associated with commissioning, systems integration testing, project management, holding costs and interest.