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Commitments And Contingencies (Capital Commitments) (Details)
$ in Millions
Dec. 31, 2015
USD ($)
Property, Plant and Equipment [Line Items]  
Cumulative Paid $ 524.9 [1]
2016 169.6
2017 320.0
2018 215.4
Total 1,229.9 [2]
ENSCO DS-10 [Member]  
Property, Plant and Equipment [Line Items]  
Cumulative Paid 236.2 [1]
2016 9.3
2017 310.5
2018 0.0
Total 556.0 [2]
ENSCO 123 [Member]  
Property, Plant and Equipment [Line Items]  
Cumulative Paid 53.5 [1]
2016 3.2
2017 9.5
2018 215.4
Total 281.6
ENSCO 140 [Member]  
Property, Plant and Equipment [Line Items]  
Cumulative Paid 156.8 [1]
2016 39.9
2017 0.0
2018 0.0
Total 196.7
ENSCO 141 [Member]  
Property, Plant and Equipment [Line Items]  
Cumulative Paid 78.4 [1]
2016 117.2
2017 0.0
2018 0.0
Total $ 195.6
[1] Cumulative paid represents the aggregate amount of contractual payments made from commencement of the construction agreement through December 31, 2015.
[2] Total commitments are based on fixed-price shipyard construction contracts, exclusive of costs associated with commissioning, systems integration testing, project management and capitalized interest.