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Guarantee Of Registered Securities (Condensed Consolidating Balance Sheets) (Details) - USD ($) $ in Millions | Sep. 30, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
Guarantor Obligations [Line Items] |  |  |  |
Cash and cash equivalents | $ 465.4 | $ 121.3 | $ 240.4 | $ 664.8
Short-term Investments | 1,302.0 | 1,180.0 |  |
Accounts receivable, net | 352.1 | 582.0 |  |
Other | 346.2 | 401.8 |  |
Total current assets | 2,465.7 | 2,285.1 |  |
PROPERTY AND EQUIPMENT, AT COST | 12,923.9 | 12,719.4 |  |
Less accumulated depreciation | 1,964.2 | 1,631.6 |  |
Property and equipment, net | 10,959.7 | 11,087.8 | 13,528.9 |
OTHER ASSETS, NET | 176.9 | 237.6 |  |
TOTAL ASSETS | 13,602.3 | 13,610.5 |  |
Accounts payable and accrued liabilities | 564.6 | 775.5 |  |
Current maturities of long-term debt | 25.6 | 0.0 |  |
Total current liabilities | 590.2 | 775.5 |  |
LONG-TERM DEBT | 4,677.0 | 5,868.6 |  |
Due to Related Parties, Noncurrent | 0.0 |  |  |
Due to Related Parties |  | 0.0 |  |
OTHER LIABILITIES | 354.1 | 449.2 |  |
ENSCO SHAREHOLDERS' EQUITY | 7,972.7 | 6,512.9 |  |
NONCONTROLLING INTERESTS | 8.3 | 4.3 |  |
Total equity | 7,981.0 | 6,517.2 |  |
Total liabilities and shareholders' equity | 13,602.3 | 13,610.5 |  |
Ensco Plc [Member] |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Cash and cash equivalents | 175.2 | 94.0 | 144.5 | 287.4
Short-term Investments | 880.0 | 1,180.0 |  |
Accounts receivable, net | 3.8 | 1.2 |  |
Accounts receivable from affiliates | 706.5 | 808.7 |  |
Other | 0.1 | 0.2 |  |
Total current assets | 1,765.6 | 2,084.1 |  |
PROPERTY AND EQUIPMENT, AT COST | 1.8 | 1.8 |  |
Less accumulated depreciation | 1.8 | 1.8 |  |
Property and equipment, net | 0.0 | 0.0 |  |
DUE FROM AFFILIATES | 1,520.7 | 1,303.7 |  |
INVESTMENTS IN AFFILIATES | 8,511.7 | 7,743.8 |  |
OTHER ASSETS, NET | 0.0 | 0.0 |  |
TOTAL ASSETS | 11,798.0 | 11,131.6 |  |
Accounts payable and accrued liabilities | 50.8 | 60.7 |  |
Accounts payable to affiliates | 45.6 | 19.4 |  |
Current maturities of long-term debt | 23.8 |  |  |
Total current liabilities | 120.2 | 80.1 |  |
Due to Affiliate | 771.3 | 751.9 |  |
LONG-TERM DEBT | 2,925.5 | 3,782.4 |  |
Due to Related Parties, Noncurrent | 0.0 |  |  |
Due to Related Parties |  | 0.0 |  |
OTHER LIABILITIES |  | 0.0 |  |
ENSCO SHAREHOLDERS' EQUITY | 7,981.0 | 6,517.2 |  |
Total equity | 7,981.0 | 6,517.2 |  |
Total liabilities and shareholders' equity | 11,798.0 | 11,131.6 |  |
ENSCO International Inc. [Member] |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Cash and cash equivalents | 0.0 | 0.0 | 0.1 | 0.0
Short-term Investments | 0.0 | 0.0 |  |
Accounts receivable, net | 0.0 |  |  |
Accounts receivable from affiliates | 661.5 | 237.3 |  |
Other | 24.6 | 229.3 |  |
Total current assets | 686.1 | 466.6 |  |
PROPERTY AND EQUIPMENT, AT COST | 120.2 | 117.5 |  |
Less accumulated depreciation | 59.6 | 47.7 |  |
Property and equipment, net | 60.6 | 69.8 |  |
DUE FROM AFFILIATES | 5,207.2 | 5,270.0 |  |
INVESTMENTS IN AFFILIATES | 975.9 | 0.0 |  |
OTHER ASSETS, NET | 69.8 | 43.1 |  |
TOTAL ASSETS | 6,999.6 | 5,849.5 |  |
Accounts payable and accrued liabilities | 42.4 | 69.6 |  |
Accounts payable to affiliates | 643.4 | 176.3 |  |
Current maturities of long-term debt | 0.0 |  |  |
Total current liabilities | 685.8 | 245.9 |  |
Due to Affiliate | 5,519.0 | 4,354.3 |  |
LONG-TERM DEBT | 149.2 | 149.0 |  |
Due to Related Parties, Noncurrent | 0.0 |  |  |
Due to Related Parties |  | 442.0 |  |
OTHER LIABILITIES | 3.7 | 135.7 |  |
ENSCO SHAREHOLDERS' EQUITY | 641.9 | 522.6 |  |
Total equity | 641.9 | 522.6 |  |
Total liabilities and shareholders' equity | 6,999.6 | 5,849.5 |  |
Pride International, Inc. [Member] |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Cash and cash equivalents | 20.8 | 2.0 | 14.6 | 90.8
Short-term Investments | 0.0 | 0.0 |  |
Accounts receivable, net | 0.0 |  |  |
Accounts receivable from affiliates | 0.1 | 0.0 |  |
Total current assets | 20.9 | 2.0 |  |
DUE FROM AFFILIATES | 2,008.5 | 2,035.5 |  |
INVESTMENTS IN AFFILIATES | 0.0 | 0.0 |  |
TOTAL ASSETS | 2,029.4 | 2,037.5 |  |
Accounts payable and accrued liabilities | 20.0 | 34.8 |  |
Accounts payable to affiliates | 3.4 |  |  |
Current maturities of long-term debt | 1.8 |  |  |
Total current liabilities | 25.2 | 34.8 |  |
Due to Affiliate | 2,156.6 | 1,763.7 |  |
LONG-TERM DEBT | 1,602.3 | 1,937.2 |  |
Due to Related Parties, Noncurrent | 1,234.1 |  |  |
Due to Related Parties |  | 1,319.3 |  |
OTHER LIABILITIES | 0.0 | 0.0 |  |
ENSCO SHAREHOLDERS' EQUITY | (2,988.8) | (3,017.5) |  |
Total equity | (2,988.8) | (3,017.5) |  |
Total liabilities and shareholders' equity | 2,029.4 | 2,037.5 |  |
Other Non-Guarantor Subsidiaries Of Ensco [Member] |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Cash and cash equivalents | 269.4 | 25.3 | $ 81.2 | $ 286.6
Short-term Investments | 422.0 | 0.0 |  |
Accounts receivable, net | 348.3 | 580.8 |  |
Accounts receivable from affiliates | 546.0 | 148.1 |  |
Other | 321.5 | 172.3 |  |
Total current assets | 1,907.2 | 926.5 |  |
PROPERTY AND EQUIPMENT, AT COST | 12,801.9 | 12,600.1 |  |
Less accumulated depreciation | 1,902.8 | 1,582.1 |  |
Property and equipment, net | 10,899.1 | 11,018.0 |  |
DUE FROM AFFILIATES | 6,887.9 | 6,869.9 |  |
OTHER ASSETS, NET | 107.1 | 324.9 |  |
TOTAL ASSETS | 19,801.3 | 19,139.3 |  |
Accounts payable and accrued liabilities | 451.4 | 610.4 |  |
Accounts payable to affiliates | 1,221.7 | 998.4 |  |
Current maturities of long-term debt | 0.0 |  |  |
Total current liabilities | 1,673.1 | 1,608.8 |  |
Due to Affiliate | 7,177.4 | 8,609.2 |  |
LONG-TERM DEBT | 0.0 | 0.0 |  |
Due to Related Parties |  | 0.0 |  |
OTHER LIABILITIES | 350.4 | 443.9 |  |
ENSCO SHAREHOLDERS' EQUITY | 10,592.1 | 8,473.1 |  |
NONCONTROLLING INTERESTS | 8.3 | 4.3 |  |
Total equity | 10,600.4 | 8,477.4 |  |
Total liabilities and shareholders' equity | 19,801.3 | 19,139.3 |  |
Consolidating Adjustments [Member] |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Short-term Investments | 0.0 | 0.0 |  |
Accounts receivable, net | 0.0 |  |  |
Accounts receivable from affiliates | (1,914.1) | (1,194.1) |  |
Total current assets | (1,914.1) | (1,194.1) |  |
DUE FROM AFFILIATES | (15,624.3) | (15,479.1) |  |
INVESTMENTS IN AFFILIATES | (9,487.6) | (7,743.8) |  |
OTHER ASSETS, NET | 0.0 | (130.4) |  |
TOTAL ASSETS | (27,026.0) | (24,547.4) |  |
Accounts payable to affiliates | (1,914.1) | (1,194.1) |  |
Current maturities of long-term debt | 0.0 |  |  |
Total current liabilities | (1,914.1) | (1,194.1) |  |
Due to Affiliate | (15,624.3) | (15,479.1) |  |
Due to Related Parties, Noncurrent | (1,234.1) |  |  |
Due to Related Parties |  | (1,761.3) |  |
OTHER LIABILITIES | 0.0 | (130.4) |  |
ENSCO SHAREHOLDERS' EQUITY | (8,253.5) | (5,982.5) |  |
Total equity | (8,253.5) | (5,982.5) |  |
Total liabilities and shareholders' equity | $ (27,026.0) | $ (24,547.4) |  |

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