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Supplemental Financial Information (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Mar. 31, 2018
Segment Reporting Information [Line Items] |  |  |  |
Aggregate Contractual Capital Commitments Due In One Year | $ 92.9 |  |  |
Capitalized interest | 62.6 | $ 72.5 | $ 45.7 |
Capital expenditure accruals | 27.8 | $ 234.3 | $ 11.5 |
ENSCO 123 [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Aggregate Contractual Capital Commitments Paid |  |  |  | $ 207.4
Aggregate Contractual Capital Commitments Due In One Year | $ 9.0 |  |  |

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- Definition Amount of interest capitalized during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391 + Details
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