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Guarantee Of Registered Securities (Condensed Consolidating Balance Sheets) (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Guarantor Obligations [Line Items]        
Cash and cash equivalents $ 465.4 $ 445.4 $ 271.7 $ 1,159.7
Short-term Investments 399.0 440.0    
Accounts receivable, net 304.1 345.4    
Accounts receivable from affiliates 0.0 0.0    
Other 410.2 381.2    
Total current assets 1,578.7 1,612.0    
PROPERTY AND EQUIPMENT, AT COST 15,408.3 15,332.1    
Less accumulated depreciation 2,573.5 2,458.4    
Property and equipment, net 12,834.8 12,873.7 11,120.7  
DUE FROM AFFILIATES 0.0 0.0    
INVESTMENTS IN AFFILIATES 0.0 0.0    
OTHER ASSETS, NET 120.2 140.2    
TOTAL ASSETS 14,533.7 14,625.9    
Accounts payable and accrued liabilities 573.3 758.5    
Accounts payable to affiliates 0.0 0.0    
Total current liabilities 573.3 758.5    
Due to Affiliate, Noncurrent 0.0 0.0    
LONG-TERM DEBT 4,987.3 4,750.7    
OTHER LIABILITIES 382.0 386.7    
ENSCO SHAREHOLDERS' EQUITY 8,593.6 8,732.1    
NONCONTROLLING INTERESTS (2.5) (2.1)    
Total equity 8,591.1 8,730.0    
Total liabilities and shareholders' equity 14,533.7 14,625.9    
Ensco Plc [Member]        
Guarantor Obligations [Line Items]        
Cash and cash equivalents 321.8 185.2 180.2 892.6
Short-term Investments 399.0 440.0    
Accounts receivable, net 2.6 6.9    
Accounts receivable from affiliates 993.8 351.8    
Other 0.3 0.0    
Total current assets 1,717.5 983.9    
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 3,081.7 3,002.1    
INVESTMENTS IN AFFILIATES 8,970.7 9,098.5    
OTHER ASSETS, NET 10.5 12.9    
TOTAL ASSETS 13,780.4 13,097.4    
Accounts payable and accrued liabilities 60.8 55.4    
Accounts payable to affiliates 46.9 67.3    
Total current liabilities 107.7 122.7    
Due to Affiliate, Noncurrent 1,410.0 1,402.9    
LONG-TERM DEBT 3,671.6 2,841.8    
OTHER LIABILITIES 0.0 0.0    
ENSCO SHAREHOLDERS' EQUITY 8,591.1 8,730.0    
NONCONTROLLING INTERESTS 0.0 0.0    
Total equity 8,591.1 8,730.0    
Total liabilities and shareholders' equity 13,780.4 13,097.4    
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 0.0    
Accounts receivable, net 0.6 0.4    
Accounts receivable from affiliates 387.1 492.7    
Other 7.9 8.8    
Total current assets 395.6 501.9    
PROPERTY AND EQUIPMENT, AT COST 122.9 120.8    
Less accumulated depreciation 80.6 77.1    
Property and equipment, net 42.3 43.7    
DUE FROM AFFILIATES 2,682.2 2,618.0    
INVESTMENTS IN AFFILIATES 3,612.7 3,591.9    
OTHER ASSETS, NET 0.0 5.0    
TOTAL ASSETS 6,732.8 6,760.5    
Accounts payable and accrued liabilities 21.1 39.0    
Accounts payable to affiliates 390.4 458.3    
Total current liabilities 411.5 497.3    
Due to Affiliate, Noncurrent 3,560.2 3,559.2    
LONG-TERM DEBT 149.2 149.2    
OTHER LIABILITIES 6.6 3.1    
ENSCO SHAREHOLDERS' EQUITY 2,605.3 2,551.7    
NONCONTROLLING INTERESTS 0.0 0.0    
Total equity 2,605.3 2,551.7    
Total liabilities and shareholders' equity 6,732.8 6,760.5    
Pride International, Inc. [Member]        
Guarantor Obligations [Line Items]        
Cash and cash equivalents 14.5 25.6 15.5 19.8
Short-term Investments 0.0 0.0    
Accounts receivable, net 0.0 0.0    
Accounts receivable from affiliates 0.7 0.0    
Other 0.0 0.0    
Total current assets 15.2 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 167.3 165.1    
INVESTMENTS IN AFFILIATES 1,130.0 1,106.6    
OTHER ASSETS, NET 0.0 0.0    
TOTAL ASSETS 1,312.5 1,297.3    
Accounts payable and accrued liabilities 4.1 21.7    
Accounts payable to affiliates 8.9 12.4    
Total current liabilities 13.0 34.1    
Due to Affiliate, Noncurrent 1,398.0 753.9    
LONG-TERM DEBT 505.9 1,106.0    
OTHER LIABILITIES 0.0 0.0    
ENSCO SHAREHOLDERS' EQUITY (604.4) (596.7)    
NONCONTROLLING INTERESTS 0.0 0.0    
Total equity (604.4) (596.7)    
Total liabilities and shareholders' equity 1,312.5 1,297.3    
Other Non-Guarantor Subsidiaries Of Ensco [Member]        
Guarantor Obligations [Line Items]        
Cash and cash equivalents 129.1 234.6 76.0 247.3
Short-term Investments 0.0 0.0    
Accounts receivable, net 300.9 338.1    
Accounts receivable from affiliates 379.7 424.3    
Other 402.0 372.4    
Total current assets 1,211.7 1,369.4    
PROPERTY AND EQUIPMENT, AT COST 15,283.6 15,209.5    
Less accumulated depreciation 2,491.1 2,379.5    
Property and equipment, net 12,792.5 12,830.0    
DUE FROM AFFILIATES 4,322.7 3,736.1    
INVESTMENTS IN AFFILIATES 0.0 0.0    
OTHER ASSETS, NET 226.0 226.5    
TOTAL ASSETS 18,552.9 18,162.0    
Accounts payable and accrued liabilities 487.3 642.4    
Accounts payable to affiliates 1,315.1 730.8    
Total current liabilities 1,802.4 1,373.2    
Due to Affiliate, Noncurrent 3,885.7 3,805.3    
LONG-TERM DEBT 660.6 653.7    
OTHER LIABILITIES 491.7 487.8    
ENSCO SHAREHOLDERS' EQUITY 11,715.0 11,844.1    
NONCONTROLLING INTERESTS (2.5) (2.1)    
Total equity 11,712.5 11,842.0    
Total liabilities and shareholders' equity 18,552.9 18,162.0    
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, net 0.0 0.0    
Accounts receivable from affiliates (1,761.3) (1,268.8)    
Other 0.0 0.0    
Total current assets (1,761.3) (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 (10,253.9) (9,521.3)    
INVESTMENTS IN AFFILIATES (13,713.4) (13,797.0)    
OTHER ASSETS, NET (116.3) (104.2)    
TOTAL ASSETS (25,844.9) (24,691.3)    
Accounts payable and accrued liabilities 0.0 0.0    
Accounts payable to affiliates (1,761.3) (1,268.8)    
Total current liabilities (1,761.3) (1,268.8)    
Due to Affiliate, Noncurrent (10,253.9) (9,521.3)    
LONG-TERM DEBT 0.0 0.0    
OTHER LIABILITIES (116.3) (104.2)    
ENSCO SHAREHOLDERS' EQUITY (13,713.4) (13,797.0)    
NONCONTROLLING INTERESTS 0.0 0.0    
Total equity (13,713.4) (13,797.0)    
Total liabilities and shareholders' equity $ (25,844.9) $ (24,691.3)