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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.

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