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Impairment (Details) $ in Millions | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2015 USD ($) rigs | Sep. 30, 2014 USD ($) | Sep. 30, 2015 USD ($) rigs | Sep. 30, 2014 USD ($) | Jun. 30, 2015 rigs | Dec. 31, 2014 USD ($) rigs | May. 31, 2014 rigs
Asset Impairment Charges [Abstract] |  |  |  |  |  |  |
Impairment of Long-Lived Assets Held-for-use |  |  |  | $ 991.5 |  |  |
Loss on impairment | $ 2.4 | $ 0.0 | $ 2.4 | 703.5 |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Property, Plant and Equipment, Current | $ 127.5 |  | $ 127.5 |  |  | $ 152.4 |
Number Of Rigs Committed To Be Sold | rigs | 7 |  | 7 |  | 6 |  | 5
Floaters [Member] |  |  |  |  |  |  |
Asset Impairment Charges [Abstract] |  |  |  |  |  |  |
Loss on impairment |  |  |  | 703.5 |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |  |  |  |  |
Number Of Rigs Committed To Be Sold | rigs |  |  |  |  |  | 6 |
Discontinued Operations [Member] |  |  |  |  |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |  |  |  |  |
Impairment of Long-Lived Assets to be Disposed of | $ 25.6 |  | $ 32.8 | 546.4 |  |  |
ENSCO DS-2 [Member] | Discontinued Operations [Member] |  |  |  |  |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |  |  |  |  |
Impairment of Long-Lived Assets to be Disposed of |  |  |  | $ 288.0 |  |  |

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