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Guarantee Of Registered Securities (Condensed Consolidating Balance Sheets) (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Guarantor Obligations [Line Items] |  |  |  |
Cash and cash equivalents | $ 196.0 | $ 445.4 | $ 724.4 | $ 1,159.7
Short-term investments | 434.0 | 440.0 |  |
Accounts receivable, net | 348.5 | 345.4 |  |
Accounts receivable from affiliates | 0.0 | 0.0 |  |
Other current assets | 404.0 | 381.2 |  |
Total current assets | 1,382.5 | 1,612.0 |  |
PROPERTY AND EQUIPMENT, AT COST | 15,544.4 | 15,332.1 |  |
Less accumulated depreciation | 2,812.8 | 2,458.4 |  |
Property and equipment, net | 12,731.6 | 12,873.7 | 11,096.4 |
DUE FROM AFFILIATES | 0.0 | 0.0 |  |
INVESTMENTS IN AFFILIATES | 0.0 | 0.0 |  |
OTHER ASSETS | 104.5 | 140.2 |  |
TOTAL ASSETS | 14,218.6 | 14,625.9 |  |
Accounts payable and accrued liabilities | 535.8 | 758.5 |  |
Accounts payable to affiliates | 0.0 | 0.0 |  |
Total current liabilities | 535.8 | 758.5 |  |
Due to Affiliate | 0.0 | 0.0 |  |
LONG-TERM DEBT | 5,002.6 | 4,750.7 |  |
OTHER LIABILITIES | 390.0 | 386.7 |  |
ENSCO SHAREHOLDERS' EQUITY | 8,292.4 | 8,732.1 |  |
NONCONTROLLING INTERESTS | (2.2) | (2.1) |  |
Total equity | 8,290.2 | 8,730.0 |  |
Total liabilities and shareholders' equity | 14,218.6 | 14,625.9 |  |
Ensco plc |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Cash and cash equivalents | 146.7 | 185.2 | 516.0 | 892.6
Short-term investments | 434.0 | 440.0 |  |
Accounts receivable, net | 3.5 | 6.9 |  |
Accounts receivable from affiliates | 1,066.9 | 351.8 |  |
Other current assets | 0.3 | 0.0 |  |
Total current assets | 1,651.4 | 983.9 |  |
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 | 3,150.1 | 3,002.1 |  |
INVESTMENTS IN AFFILIATES | 8,710.2 | 9,098.5 |  |
OTHER ASSETS | 8.8 | 12.9 |  |
TOTAL ASSETS | 13,520.5 | 13,097.4 |  |
Accounts payable and accrued liabilities | 80.9 | 55.4 |  |
Accounts payable to affiliates | 50.0 | 67.3 |  |
Total current liabilities | 130.9 | 122.7 |  |
Due to Affiliate | 1,424.4 | 1,402.9 |  |
LONG-TERM DEBT | 3,674.9 | 2,841.8 |  |
OTHER LIABILITIES | 0.1 | 0.0 |  |
ENSCO SHAREHOLDERS' EQUITY | 8,290.2 | 8,730.0 |  |
NONCONTROLLING INTERESTS | 0.0 | 0.0 |  |
Total equity | 8,290.2 | 8,730.0 |  |
Total liabilities and shareholders' equity | 13,520.5 | 13,097.4 |  |
ENSCO International Incorporated |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Cash and cash equivalents | 0.0 | 0.0 | 0.0 | 0.0
Short-term investments | 0.0 | 0.0 |  |
Accounts receivable, net | 0.0 | 0.4 |  |
Accounts receivable from affiliates | 455.3 | 492.7 |  |
Other current assets | 30.1 | 8.8 |  |
Total current assets | 485.4 | 501.9 |  |
PROPERTY AND EQUIPMENT, AT COST | 125.4 | 120.8 |  |
Less accumulated depreciation | 87.7 | 77.1 |  |
Property and equipment, net | 37.7 | 43.7 |  |
DUE FROM AFFILIATES | 430.8 | 2,618.0 |  |
INVESTMENTS IN AFFILIATES | 3,669.6 | 3,591.9 |  |
OTHER ASSETS | 139.0 | 5.0 |  |
TOTAL ASSETS | 4,762.5 | 6,760.5 |  |
Accounts payable and accrued liabilities | 20.4 | 39.0 |  |
Accounts payable to affiliates | 443.2 | 458.3 |  |
Total current liabilities | 463.6 | 497.3 |  |
Due to Affiliate | 1,391.3 | 3,559.2 |  |
LONG-TERM DEBT | 149.3 | 149.2 |  |
OTHER LIABILITIES | 51.9 | 3.1 |  |
ENSCO SHAREHOLDERS' EQUITY | 2,706.4 | 2,551.7 |  |
NONCONTROLLING INTERESTS | 0.0 | 0.0 |  |
Total equity | 2,706.4 | 2,551.7 |  |
Total liabilities and shareholders' equity | 4,762.5 | 6,760.5 |  |
Pride International LLC |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Cash and cash equivalents | 5.9 | 25.6 | 20.5 | 19.8
Short-term investments | 0.0 | 0.0 |  |
Accounts receivable, net | 0.0 | 0.0 |  |
Accounts receivable from affiliates | 2.1 | 0.0 |  |
Other current assets | 0.0 | 0.0 |  |
Total current assets | 8.0 | 25.6 |  |
PROPERTY AND EQUIPMENT, AT COST | 0.0 | 0.0 |  |
Less accumulated depreciation | 0.0 | 0.0 |  |
Property and equipment, net | 0.0 | 0.0 |  |
DUE FROM AFFILIATES | 150.0 | 165.1 |  |
INVESTMENTS IN AFFILIATES | 1,175.7 | 1,106.6 |  |
OTHER ASSETS | 0.0 | 0.0 |  |
TOTAL ASSETS | 1,333.7 | 1,297.3 |  |
Accounts payable and accrued liabilities | 4.6 | 21.7 |  |
Accounts payable to affiliates | 19.1 | 12.4 |  |
Total current liabilities | 23.7 | 34.1 |  |
Due to Affiliate | 1,403.4 | 753.9 |  |
LONG-TERM DEBT | 503.7 | 1,106.0 |  |
OTHER LIABILITIES | 0.0 | 0.0 |  |
ENSCO SHAREHOLDERS' EQUITY | (597.1) | (596.7) |  |
NONCONTROLLING INTERESTS | 0.0 | 0.0 |  |
Total equity | (597.1) | (596.7) |  |
Total liabilities and shareholders' equity | 1,333.7 | 1,297.3 |  |
Other Non-Guarantor Subsidiaries of Ensco |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Cash and cash equivalents | 43.4 | 234.6 | 187.9 | 247.3
Short-term investments | 0.0 | 0.0 |  |
Accounts receivable, net | 345.0 | 338.1 |  |
Accounts receivable from affiliates | 412.9 | 424.3 |  |
Other current assets | 373.6 | 372.4 |  |
Total current assets | 1,174.9 | 1,369.4 |  |
PROPERTY AND EQUIPMENT, AT COST | 15,417.2 | 15,209.5 |  |
Less accumulated depreciation | 2,723.3 | 2,379.5 |  |
Property and equipment, net | 12,693.9 | 12,830.0 |  |
DUE FROM AFFILIATES | 2,173.6 | 3,736.1 |  |
INVESTMENTS IN AFFILIATES | 0.0 | 0.0 |  |
OTHER ASSETS | 0.0 | 226.5 |  |
TOTAL ASSETS | 16,042.4 | 18,162.0 |  |
Accounts payable and accrued liabilities | 429.9 | 642.4 |  |
Accounts payable to affiliates | 1,424.9 | 730.8 |  |
Total current liabilities | 1,854.8 | 1,373.2 |  |
Due to Affiliate | 1,685.4 | 3,805.3 |  |
LONG-TERM DEBT | 674.7 | 653.7 |  |
OTHER LIABILITIES | 381.3 | 487.8 |  |
ENSCO SHAREHOLDERS' EQUITY | 11,448.4 | 11,844.1 |  |
NONCONTROLLING INTERESTS | (2.2) | (2.1) |  |
Total equity | 11,446.2 | 11,842.0 |  |
Total liabilities and shareholders' equity | 16,042.4 | 18,162.0 |  |
Consolidating Adjustments |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Cash and cash equivalents | 0.0 | 0.0 | $ 0.0 | $ 0.0
Short-term investments | 0.0 | 0.0 |  |
Accounts receivable, net | 0.0 | 0.0 |  |
Accounts receivable from affiliates | (1,937.2) | (1,268.8) |  |
Other current assets | 0.0 | 0.0 |  |
Total current assets | (1,937.2) | (1,268.8) |  |
PROPERTY AND EQUIPMENT, AT COST | 0.0 | 0.0 |  |
Less accumulated depreciation | 0.0 | 0.0 |  |
Property and equipment, net | 0.0 | 0.0 |  |
DUE FROM AFFILIATES | (5,904.5) | (9,521.3) |  |
INVESTMENTS IN AFFILIATES | (13,555.5) | (13,797.0) |  |
OTHER ASSETS | (43.3) | (104.2) |  |
TOTAL ASSETS | (21,440.5) | (24,691.3) |  |
Accounts payable and accrued liabilities | 0.0 | 0.0 |  |
Accounts payable to affiliates | (1,937.2) | (1,268.8) |  |
Total current liabilities | (1,937.2) | (1,268.8) |  |
Due to Affiliate | (5,904.5) | (9,521.3) |  |
LONG-TERM DEBT | 0.0 | 0.0 |  |
OTHER LIABILITIES | (43.3) | (104.2) |  |
ENSCO SHAREHOLDERS' EQUITY | (13,555.5) | (13,797.0) |  |
NONCONTROLLING INTERESTS | 0.0 | 0.0 |  |
Total equity | (13,555.5) | (13,797.0) |  |
Total liabilities and shareholders' equity | $ (21,440.5) | $ (24,691.3) |  |

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