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Impairment (Details) $ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2015 USD ($) rigs | Jun. 30, 2014 USD ($) | Jun. 30, 2015 USD ($) rigs | Jun. 30, 2014 USD ($) | Dec. 31, 2014 rigs | May. 31, 2014 rigs
Asset Impairment Charges [Abstract] |  |  |  |  |  |
Impairment of Long-Lived Assets Held-for-use |  |  |  | $ 991.5 |  |
Asset Impairment Charges | $ 0.0 | $ 703.5 | $ 0.0 | 703.5 |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |  |  |  |
Number Of Rigs Committed To Be Sold | rigs | 6 |  | 6 |  |  | 5
Floaters [Member] |  |  |  |  |  |
Asset Impairment Charges [Abstract] |  |  |  |  |  |
Asset Impairment Charges |  | $ 703.5 |  | 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 |  |  |  | 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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