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Guarantee Of Registered Securities (Condensed Consolidating Balance Sheets) (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Guarantor Obligations [Line Items]        
Cash and cash equivalents $ 445.4 $ 1,159.7 $ 121.3 $ 664.8
Short-term Investments 440.0 1,442.6    
Accounts receivable 345.4 361.0    
Accounts receivable from affiliates 0.0 0.0    
Other 381.2 316.0    
Total current assets 1,612.0 3,279.3    
PROPERTY AND EQUIPMENT, AT COST 15,332.1 12,992.5    
Less accumulated depreciation 2,458.4 2,073.2    
Property and equipment, net 12,873.7 10,919.3 11,087.8  
DUE FROM AFFILIATES 0.0 0.0    
INVESTMENTS IN AFFILIATES 0.0 0.0    
OTHER ASSETS, NET 140.2 175.9    
TOTAL ASSETS 14,625.9 14,374.5    
Accounts payable and accrued liabilities 758.5 522.5    
Accounts payable to affiliates 0.0 0.0    
Current maturities of long-term debt 0.0 331.9    
Total current liabilities 758.5 854.4    
DUE TO AFFILIATES 0.0 0.0    
LONG-TERM DEBT 4,750.7 4,942.6    
OTHER LIABILITIES 386.7 322.5    
ENSCO SHAREHOLDERS' EQUITY 8,732.1 8,250.6    
NONCONTROLLING INTERESTS (2.1) 4.4    
Total equity 8,730.0 8,255.0    
Total liabilities and shareholders' equity 14,625.9 14,374.5    
Ensco Plc [Member]        
Guarantor Obligations [Line Items]        
Cash and cash equivalents 185.2 892.6 94.0 287.4
Short-term Investments 440.0 1,165.1    
Accounts receivable 6.9 6.8    
Accounts receivable from affiliates 351.8 486.5    
Other 0.0 0.1    
Total current assets 983.9 2,551.1    
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 3,002.1 1,512.2    
INVESTMENTS IN AFFILIATES 9,098.5 8,557.7    
OTHER ASSETS, NET 12.9 0.0    
TOTAL ASSETS 13,097.4 12,621.0    
Accounts payable and accrued liabilities 55.4 44.1    
Accounts payable to affiliates 67.3 38.8    
Current maturities of long-term debt 0.0 187.1    
Total current liabilities 122.7 270.0    
DUE TO AFFILIATES 1,402.9 1,375.8    
LONG-TERM DEBT 2,841.8 2,720.2    
OTHER LIABILITIES 0.0 0.0    
ENSCO SHAREHOLDERS' EQUITY 8,730.0 8,255.0    
NONCONTROLLING INTERESTS 0.0 0.0    
Total equity 8,730.0 8,255.0    
Total liabilities and shareholders' equity 13,097.4 12,621.0    
ENSCO International Inc. [Member]        
Guarantor Obligations [Line Items]        
Cash and cash equivalents 0.0 0.0 0.0 0.0
Short-term Investments 0.0 5.5    
Accounts receivable 0.4 0.0    
Accounts receivable from affiliates 492.7 251.2    
Other 8.8 6.8    
Total current assets 501.9 263.5    
PROPERTY AND EQUIPMENT, AT COST 120.8 121.0    
Less accumulated depreciation 77.1 63.8    
Property and equipment, net 43.7 57.2    
DUE FROM AFFILIATES 2,618.0 4,513.8    
INVESTMENTS IN AFFILIATES 3,591.9 3,462.3    
OTHER ASSETS, NET 5.0 81.5    
TOTAL ASSETS 6,760.5 8,378.3    
Accounts payable and accrued liabilities 39.0 45.2    
Accounts payable to affiliates 458.3 208.4    
Current maturities of long-term debt 0.0 0.0    
Total current liabilities 497.3 253.6    
DUE TO AFFILIATES 3,559.2 5,367.6    
LONG-TERM DEBT 149.2 149.2    
OTHER LIABILITIES 3.1 2.9    
ENSCO SHAREHOLDERS' EQUITY 2,551.7 2,605.0    
NONCONTROLLING INTERESTS 0.0 0.0    
Total equity 2,551.7 2,605.0    
Total liabilities and shareholders' equity 6,760.5 8,378.3    
Pride International Inc. [Member]        
Guarantor Obligations [Line Items]        
Cash and cash equivalents 25.6 19.8 2.0 90.8
Short-term Investments 0.0 0.0    
Accounts receivable 0.0 0.0    
Accounts receivable from affiliates 0.0 0.0    
Other 0.0 0.0    
Total current assets 25.6 19.8    
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 165.1 1,978.8    
INVESTMENTS IN AFFILIATES 1,106.6 1,061.3    
OTHER ASSETS, NET 0.0 0.0    
TOTAL ASSETS 1,297.3 3,059.9    
Accounts payable and accrued liabilities 21.7 28.3    
Accounts payable to affiliates 12.4 5.9    
Current maturities of long-term debt 0.0 144.8    
Total current liabilities 34.1 179.0    
DUE TO AFFILIATES 753.9 2,040.7    
LONG-TERM DEBT 1,106.0 1,449.5    
OTHER LIABILITIES 0.0    
ENSCO SHAREHOLDERS' EQUITY (596.7) (609.3)    
NONCONTROLLING INTERESTS 0.0 0.0    
Total equity (596.7) (609.3)    
Total liabilities and shareholders' equity 1,297.3 3,059.9    
Other Non-Guarantor Subsidiaries Of Ensco [Member]        
Guarantor Obligations [Line Items]        
Cash and cash equivalents 234.6 247.3 25.3 286.6
Short-term Investments 0.0 272.0    
Accounts receivable 338.1 354.2    
Accounts receivable from affiliates 424.3 152.3    
Other 372.4 309.1    
Total current assets 1,369.4 1,334.9    
PROPERTY AND EQUIPMENT, AT COST 15,209.5 12,869.7    
Less accumulated depreciation 2,379.5 2,007.6    
Property and equipment, net 12,830.0 10,862.1    
DUE FROM AFFILIATES 3,736.1 7,234.3    
INVESTMENTS IN AFFILIATES 0.0 0.0    
OTHER ASSETS, NET 226.5 181.1    
TOTAL ASSETS 18,162.0 19,612.4    
Accounts payable and accrued liabilities 642.4 404.9    
Accounts payable to affiliates 730.8 636.9    
Current maturities of long-term debt 0.0    
Total current liabilities 1,373.2 1,041.8    
DUE TO AFFILIATES 3,805.3 6,455.0    
LONG-TERM DEBT 653.7 623.7    
OTHER LIABILITIES 487.8 406.3    
ENSCO SHAREHOLDERS' EQUITY 11,844.1 11,081.2    
NONCONTROLLING INTERESTS (2.1) 4.4    
Total equity 11,842.0 11,085.6    
Total liabilities and shareholders' equity 18,162.0 19,612.4    
Consolidating Adjustments [Member]        
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 0.0 0.0    
Accounts receivable from affiliates (1,268.8) (890.0)    
Other 0.0 0.0    
Total current assets (1,268.8) (890.0)    
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 (9,521.3) (15,239.1)    
INVESTMENTS IN AFFILIATES (13,797.0) (13,081.3)    
OTHER ASSETS, NET (104.2) (86.7)    
TOTAL ASSETS (24,691.3) (29,297.1)    
Accounts payable and accrued liabilities 0.0 0.0    
Accounts payable to affiliates (1,268.8) (890.0)    
Current maturities of long-term debt 0.0 0.0    
Total current liabilities (1,268.8) (890.0)    
DUE TO AFFILIATES (9,521.3) (15,239.1)    
LONG-TERM DEBT 0.0 0.0    
OTHER LIABILITIES (104.2) (86.7)    
ENSCO SHAREHOLDERS' EQUITY (13,797.0) (13,081.3)    
NONCONTROLLING INTERESTS 0.0 0.0    
Total equity (13,797.0) (13,081.3)    
Total liabilities and shareholders' equity $ (24,691.3) $ (29,297.1)