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Discontinued Operations (Narrative) (Details) $ in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2015 USD ($) rigs | Dec. 31, 2014 USD ($) rigs | Sep. 30, 2014 USD ($) | Sep. 30, 2015 USD ($) rigs | Sep. 30, 2014 USD ($) | Jun. 30, 2015 rigs | May. 31, 2014 rigs
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Discontinued Operations, Income Tax Expense (Benefit), Discrete Item |  |  |  | $ (11.9) |  |  |
Disposal Group, Including Discontinued Operation, Property, Plant and Equipment, Current | $ 127.5 | $ 152.4 |  | $ 127.5 |  |  |
Number Of Rigs Committed To Be Sold | rigs | 7 |  |  | 7 |  | 6 | 5
Impairment of Long-Lived Assets to be Disposed of, Net of Tax Benefit | $ 17.3 |  | $ 0.0 | $ 24.5 | $ 796.8 |  |
Debt Instrument Carrying Value | $ 5,903.3 | $ 5,920.4 |  | 5,903.3 |  |  |
Floaters [Member] |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Number Of Rigs Committed To Be Sold | rigs |  | 6 |  |  |  |  |
Jackup [Member] |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Number Of Rigs Committed To Be Sold | rigs |  | 2 |  |  |  |  |
ENSCO5002 [Member] | Floaters [Member] |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax |  |  |  | (1.6) |  |  |
Net proceeds from rig sale |  |  |  | $ 1.6 |  |  |
ENSCO69andPrideWisconsin [Member] | Jackup [Member] |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax |  |  |  |  | (23.6) |  |
Net proceeds from rig sale |  |  |  |  | 32.2 |  |
ENSCO 5000 [Member] | Floaters [Member] |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Net proceeds from rig sale |  | $ 1.3 |  |  |  |  |
ENSCO 85 [Member] | Jackup [Member] |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax |  |  |  |  | (10.3) |  |
Net proceeds from rig sale |  |  |  |  | 64.4 |  |
Ensco 93 [Member] | Jackup [Member] |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax |  |  |  |  | $ 1.2 |  |
Net proceeds from rig sale |  | $ 51.7 |  |  |  |  |

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