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Commitments And Contingencies (Capital Commitments) (Details) $ in Millions | Dec. 31, 2015 USD ($)
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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.

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