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Guarantee Of Registered Securities (Condensed Consolidating Balance Sheets) (Details) - USD ($) $ in Millions | Sep. 30, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Dec. 31, 2013
--- | --- | --- | --- | ---
Guarantor Obligations [Line Items] |  |  |  |
Cash and cash equivalents | $ 240.4 | $ 664.8 | $ 1,173.7 | $ 165.6
Short-term Investments | 850.0 | 757.3 |  |
Accounts receivable, net | 735.6 | 883.3 |  |
Other | 586.6 | 629.4 |  |
Total current assets | 2,412.6 | 2,934.8 |  |
PROPERTY AND EQUIPMENT, AT COST | 16,389.2 | 14,975.5 |  |
Less accumulated depreciation | 2,860.3 | 2,440.7 |  |
Property and equipment, net | 13,528.9 | 12,534.8 | 13,127.6 |
Goodwill | 276.1 | 276.1 |  |
OTHER ASSETS, NET | 223.2 | 314.2 |  |
TOTAL ASSETS | 16,440.8 | 16,059.9 |  |
Accounts payable and accrued liabilities | 803.1 | 1,069.8 |  |
Current maturities of long-term debt | 0.0 | 34.8 |  |
Total current liabilities | 803.1 | 1,104.6 |  |
LONG-TERM DEBT | 5,903.3 | 5,885.6 |  |
DEFERRED INCOME TAXES | 208.0 | 179.5 |  |
OTHER LIABILITIES | 504.6 | 667.3 |  |
ENSCO SHAREHOLDERS' EQUITY | 9,011.1 | 8,215.0 |  |
NONCONTROLLING INTERESTS | 10.7 | 7.9 |  |
Total equity | 9,021.8 | 8,222.9 |  |
Total liabilities and shareholders' equity | 16,440.8 | 16,059.9 |  |
Ensco Plc [Member] |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Cash and cash equivalents | 144.5 | 287.4 | 367.0 | 46.5
Short-term Investments | 850.0 | 712.0 |  |
Accounts receivable, net | 0.0 |  |  |
Accounts receivable from affiliates | 35.3 | 34.5 |  |
Other | 0.5 | 4.1 |  |
Total current assets | 1,030.3 | 1,038.0 |  |
PROPERTY AND EQUIPMENT, AT COST | 2.1 | 2.1 |  |
Less accumulated depreciation | 1.8 | 1.7 |  |
Property and equipment, net | 0.3 | 0.4 |  |
Goodwill | 0.0 | 0.0 |  |
DUE FROM AFFILIATES | 2,727.7 | 2,873.2 |  |
INVESTMENTS IN AFFILIATES | 10,159.4 | 9,084.8 |  |
OTHER ASSETS, NET | 27.0 | 17.0 |  |
TOTAL ASSETS | 13,944.7 | 13,013.4 |  |
Accounts payable and accrued liabilities | 50.7 | 47.8 |  |
Accounts payable to affiliates | 22.4 | 23.5 |  |
Total current liabilities | 73.1 | 71.3 |  |
DUE TO AFFILIATES | 1,042.0 | 994.8 |  |
LONG-TERM DEBT | 3,807.8 | 3,724.4 |  |
DEFERRED INCOME TAXES | 0.0 |  |  |
ENSCO SHAREHOLDERS' EQUITY | 9,021.8 | 8,222.9 |  |
Total equity | 9,021.8 | 8,222.9 |  |
Total liabilities and shareholders' equity | 13,944.7 | 13,013.4 |  |
ENSCO International Inc. [Member] |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Cash and cash equivalents | 0.1 | 0.0 | 0.0 | 0.5
Short-term Investments | 0.0 | 0.0 |  |
Accounts receivable, net | 0.0 |  |  |
Accounts receivable from affiliates | 190.3 | 210.4 |  |
Other | 84.3 | 86.9 |  |
Total current assets | 274.7 | 297.3 |  |
PROPERTY AND EQUIPMENT, AT COST | 115.3 | 71.5 |  |
Less accumulated depreciation | 43.3 | 34.1 |  |
Property and equipment, net | 72.0 | 37.4 |  |
Goodwill | 0.0 |  |  |
DUE FROM AFFILIATES | 5,593.2 | 4,748.2 |  |
INVESTMENTS IN AFFILIATES | 1,440.6 | 1,233.5 |  |
OTHER ASSETS, NET | 44.3 | 47.4 |  |
TOTAL ASSETS | 7,424.8 | 6,363.8 |  |
Accounts payable and accrued liabilities | 56.2 | 42.8 |  |
Accounts payable to affiliates | 129.3 | 158.3 |  |
Total current liabilities | 185.5 | 201.1 |  |
DUE TO AFFILIATES | 4,690.5 | 3,817.4 |  |
LONG-TERM DEBT | 149.2 | 149.2 |  |
DEFERRED INCOME TAXES | 208.0 | 176.8 |  |
OTHER LIABILITIES | 6.6 | 6.1 |  |
ENSCO SHAREHOLDERS' EQUITY | 2,185.0 | 2,013.2 |  |
Total equity | 2,185.0 | 2,013.2 |  |
Total liabilities and shareholders' equity | 7,424.8 | 6,363.8 |  |
Pride International, Inc. [Member] |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Cash and cash equivalents | 14.6 | 90.8 | 343.0 | 4.9
Short-term Investments | 0.0 | 0.0 |  |
Accounts receivable, net | 0.0 |  |  |
Accounts receivable from affiliates | 0.0 | 0.0 |  |
Total current assets | 14.6 | 90.8 |  |
Goodwill | 0.0 | 0.0 |  |
DUE FROM AFFILIATES | 2,084.6 | 1,835.0 |  |
INVESTMENTS IN AFFILIATES | 612.5 | 461.6 |  |
TOTAL ASSETS | 2,711.7 | 2,387.4 |  |
Accounts payable and accrued liabilities | 23.4 | 34.3 |  |
Total current liabilities | 23.4 | 34.3 |  |
DUE TO AFFILIATES | 1,805.0 | 1,547.7 |  |
LONG-TERM DEBT | 1,946.3 | 1,973.2 |  |
OTHER LIABILITIES | 5.5 | 7.0 |  |
ENSCO SHAREHOLDERS' EQUITY | (1,068.5) | (1,174.8) |  |
Total equity | (1,068.5) | (1,174.8) |  |
Total liabilities and shareholders' equity | 2,711.7 | 2,387.4 |  |
Other Non-Guarantor Subsidiaries Of Ensco [Member] |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Cash and cash equivalents | 81.2 | 286.6 | $ 463.7 | $ 113.7
Short-term Investments | 0.0 | 45.3 |  |
Accounts receivable, net | 735.6 | 883.3 |  |
Accounts receivable from affiliates | 116.6 | 134.6 |  |
Other | 501.8 | 538.4 |  |
Total current assets | 1,435.2 | 1,888.2 |  |
PROPERTY AND EQUIPMENT, AT COST | 16,271.8 | 14,901.9 |  |
Less accumulated depreciation | 2,815.2 | 2,404.9 |  |
Property and equipment, net | 13,456.6 | 12,497.0 |  |
Goodwill | 276.1 | 276.1 |  |
DUE FROM AFFILIATES | 7,489.8 | 6,308.8 |  |
OTHER ASSETS, NET | 151.9 | 249.8 |  |
TOTAL ASSETS | 22,809.6 | 21,219.9 |  |
Accounts payable and accrued liabilities | 672.8 | 944.9 |  |
Accounts payable to affiliates | 190.5 | 197.7 |  |
Current maturities of long-term debt |  | 34.8 |  |
Total current liabilities | 863.3 | 1,177.4 |  |
DUE TO AFFILIATES | 10,357.8 | 9,405.3 |  |
LONG-TERM DEBT | 0.0 | 38.8 |  |
DEFERRED INCOME TAXES | 0.0 | 2.7 |  |
OTHER LIABILITIES | 492.5 | 654.2 |  |
ENSCO SHAREHOLDERS' EQUITY | 11,085.3 | 9,933.6 |  |
NONCONTROLLING INTERESTS | 10.7 | 7.9 |  |
Total equity | 11,096.0 | 9,941.5 |  |
Total liabilities and shareholders' equity | 22,809.6 | 21,219.9 |  |
Consolidating Adjustments [Member] |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Short-term Investments | 0.0 | 0.0 |  |
Accounts receivable, net | 0.0 |  |  |
Accounts receivable from affiliates | (342.2) | (379.5) |  |
Total current assets | (342.2) | (379.5) |  |
Goodwill | 0.0 | 0.0 |  |
DUE FROM AFFILIATES | (17,895.3) | (15,765.2) |  |
INVESTMENTS IN AFFILIATES | (12,212.5) | (10,779.9) |  |
TOTAL ASSETS | (30,450.0) | (26,924.6) |  |
Accounts payable to affiliates | (342.2) | (379.5) |  |
Total current liabilities | (342.2) | (379.5) |  |
DUE TO AFFILIATES | (17,895.3) | (15,765.2) |  |
ENSCO SHAREHOLDERS' EQUITY | (12,212.5) | (10,779.9) |  |
Total equity | (12,212.5) | (10,779.9) |  |
Total liabilities and shareholders' equity | $ (30,450.0) | $ (26,924.6) |  |

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