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Commitments And Contingencies (Capital Commitments) (Details)
$ in Millions
Dec. 31, 2016
USD ($)
Property, Plant and Equipment [Line Items]  
Cumulative Paid $ 302.9 [1]
2017 242.0
2018 215.3
2019 75.0
Total 835.2 [2]
ENSCO DS-10 [Member]  
Property, Plant and Equipment [Line Items]  
Cumulative Paid 245.4 [1]
2017 234.0
2018 0.0
2019 75.0 [3]
Total 554.4 [2]
ENSCO 123 [Member]  
Property, Plant and Equipment [Line Items]  
Cumulative Paid 57.5 [1]
2017 8.0
2018 215.3
2019 0.0
Total $ 280.8 [2]
[1] Cumulative paid represents the aggregate amount of contractual payments made from commencement of the construction agreement through December 31, 2016.
[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.
[3] (3) In January 2017, we reached an agreement with the shipyard constructing ENSCO DS-10 to further delay delivery and $75.0 million of the final milestone payment until the first quarter of 2019, or such earlier date as we may elect to take delivery.