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Guarantee Of Registered Securities (Condensed Consolidating Balance Sheets) (Details) - USD ($)
Mar. 31, 2016
Dec. 31, 2015
Mar. 31, 2015
Dec. 31, 2014
Guarantor Obligations [Line Items]        
Cash and cash equivalents $ 1,084,000,000 $ 121,300,000 $ 887,800,000 $ 664,800,000
Short-term Investments 295,000,000 1,180,000,000    
Accounts receivable, net 574,000,000 582,000,000    
Accounts receivable from affiliates 0 0    
Other 369,800,000 401,800,000    
Total current assets 2,322,800,000 2,285,100,000    
PROPERTY AND EQUIPMENT, AT COST 12,841,200,000 12,719,400,000    
Less accumulated depreciation 1,744,100,000 1,631,600,000    
Property and equipment, net 11,097,100,000 11,087,800,000 12,725,300,000  
DUE FROM AFFILIATES 0 0    
INVESTMENTS IN AFFILIATES 0 0    
OTHER ASSETS, NET 190,100,000 237,600,000    
TOTAL ASSETS 13,610,000,000 13,610,500,000    
Accounts payable and accrued liabilities 637,400,000 775,500,000    
Accounts payable to affiliates 0 0    
Current maturities of long-term debt 870,000,000 0    
Total current liabilities 1,507,400,000 775,500,000    
Due to Affiliate, Noncurrent 0 0    
DUE TO AFFILIATES 0 0    
LONG-TERM DEBT 4,991,000,000 5,868,600,000    
OTHER LIABILITIES 405,200,000 449,200,000    
ENSCO SHAREHOLDERS' EQUITY 6,700,700,000 6,512,900,000    
NONCONTROLLING INTERESTS 5,700,000 4,300,000    
Total equity 6,706,400,000 6,517,200,000    
Total liabilities and shareholders' equity 13,610,000,000 13,610,500,000    
Ensco Plc [Member]        
Guarantor Obligations [Line Items]        
Cash and cash equivalents 1,049,700,000 94,000,000 286,500,000 287,400,000
Short-term Investments 295,000,000 1,180,000,000    
Accounts receivable, net 1,100,000 1,200,000    
Accounts receivable from affiliates 698,400,000 808,700,000    
Other 100,000 200,000    
Total current assets 2,044,300,000 2,084,100,000    
PROPERTY AND EQUIPMENT, AT COST 1,800,000 1,800,000    
Less accumulated depreciation 1,800,000 1,800,000    
Property and equipment, net 0 0    
DUE FROM AFFILIATES 1,315,300,000 1,303,700,000    
INVESTMENTS IN AFFILIATES 7,978,800,000 7,743,800,000    
OTHER ASSETS, NET 0 0    
TOTAL ASSETS 11,338,400,000 11,131,600,000    
Accounts payable and accrued liabilities 53,600,000 60,700,000    
Accounts payable to affiliates 32,900,000 19,400,000    
Current maturities of long-term debt 665,100,000 0    
Total current liabilities 751,600,000 80,100,000    
Due to Affiliate, Noncurrent 761,400,000 751,900,000    
DUE TO AFFILIATES 0 0    
LONG-TERM DEBT 3,119,000,000 3,782,400,000    
OTHER LIABILITIES 0 0    
ENSCO SHAREHOLDERS' EQUITY 6,706,400,000 6,517,200,000    
NONCONTROLLING INTERESTS 0 0    
Total equity 6,706,400,000 6,517,200,000    
Total liabilities and shareholders' equity 11,338,400,000 11,131,600,000    
ENSCO International Inc. [Member]        
Guarantor Obligations [Line Items]        
Cash and cash equivalents 0 0 0 0
Short-term Investments 0 0    
Accounts receivable, net 0 0    
Accounts receivable from affiliates 735,200,000 237,300,000    
Other 16,300,000 229,300,000    
Total current assets 751,500,000 466,600,000    
PROPERTY AND EQUIPMENT, AT COST 117,500,000 117,500,000    
Less accumulated depreciation 52,000,000 47,700,000    
Property and equipment, net 65,500,000 69,800,000    
DUE FROM AFFILIATES 5,018,500,000 5,270,000,000    
INVESTMENTS IN AFFILIATES 0 0    
OTHER ASSETS, NET 41,100,000 43,100,000    
TOTAL ASSETS 5,876,600,000 5,849,500,000    
Accounts payable and accrued liabilities 23,400,000 69,600,000    
Accounts payable to affiliates 674,200,000 176,300,000    
Current maturities of long-term debt 0 0    
Total current liabilities 697,600,000 245,900,000    
Due to Affiliate, Noncurrent 4,096,800,000 4,354,300,000    
DUE TO AFFILIATES 372,500,000 442,000,000    
LONG-TERM DEBT 149,100,000 149,000,000    
OTHER LIABILITIES 169,000,000 135,700,000    
ENSCO SHAREHOLDERS' EQUITY 391,600,000 522,600,000    
NONCONTROLLING INTERESTS 0 0    
Total equity 391,600,000 522,600,000    
Total liabilities and shareholders' equity 5,876,600,000 5,849,500,000    
Pride International, Inc. [Member]        
Guarantor Obligations [Line Items]        
Cash and cash equivalents 2,000,000 2,000,000 249,400,000 90,800,000
Short-term Investments 0 0    
Accounts receivable, net 0 0    
Accounts receivable from affiliates 0 0    
Other 0 0    
Total current assets 2,000,000 2,000,000    
PROPERTY AND EQUIPMENT, AT COST 0 0    
Less accumulated depreciation 0 0    
Property and equipment, net 0 0    
DUE FROM AFFILIATES 2,039,200,000 2,035,500,000    
INVESTMENTS IN AFFILIATES 0 0    
OTHER ASSETS, NET 0 0    
TOTAL ASSETS 2,041,200,000 2,037,500,000    
Accounts payable and accrued liabilities 24,100,000 34,800,000    
Accounts payable to affiliates 0 0    
Current maturities of long-term debt 204,900,000 0    
Total current liabilities 229,000,000 34,800,000    
Due to Affiliate, Noncurrent 1,806,600,000 1,763,700,000    
DUE TO AFFILIATES 1,225,800,000 1,319,300,000    
LONG-TERM DEBT 1,722,900,000 1,937,200,000    
OTHER LIABILITIES 0 0    
ENSCO SHAREHOLDERS' EQUITY (2,943,100,000) (3,017,500,000)    
NONCONTROLLING INTERESTS 0 0    
Total equity (2,943,100,000) (3,017,500,000)    
Total liabilities and shareholders' equity 2,041,200,000 2,037,500,000    
Other Non-Guarantor Subsidiaries Of Ensco [Member]        
Guarantor Obligations [Line Items]        
Cash and cash equivalents 32,300,000 25,300,000 351,900,000 286,600,000
Short-term Investments 0 0    
Accounts receivable, net 572,900,000 580,800,000    
Accounts receivable from affiliates 648,600,000 148,100,000    
Other 353,400,000 172,300,000    
Total current assets 1,607,200,000 926,500,000    
PROPERTY AND EQUIPMENT, AT COST 12,721,900,000 12,600,100,000    
Less accumulated depreciation 1,690,300,000 1,582,100,000    
Property and equipment, net 11,031,600,000 11,018,000,000    
DUE FROM AFFILIATES 6,664,800,000 6,869,900,000    
INVESTMENTS IN AFFILIATES 0 0    
OTHER ASSETS, NET 308,200,000 324,900,000    
TOTAL ASSETS 19,611,800,000 19,139,300,000    
Accounts payable and accrued liabilities 536,300,000 610,400,000    
Accounts payable to affiliates 1,375,100,000 998,400,000    
Current maturities of long-term debt 0 0    
Total current liabilities 1,911,400,000 1,608,800,000    
Due to Affiliate, Noncurrent 8,373,000,000 8,609,200,000    
DUE TO AFFILIATES 0 0    
LONG-TERM DEBT 0 0    
OTHER LIABILITIES 395,400,000 443,900,000    
ENSCO SHAREHOLDERS' EQUITY 8,926,300,000 8,473,100,000    
NONCONTROLLING INTERESTS 5,700,000 4,300,000    
Total equity 8,932,000,000 8,477,400,000    
Total liabilities and shareholders' equity 19,611,800,000 19,139,300,000    
Consolidating Adjustments [Member]        
Guarantor Obligations [Line Items]        
Cash and cash equivalents 0 0 $ 0 $ 0
Short-term Investments 0 0    
Accounts receivable, net 0 0    
Accounts receivable from affiliates (2,082,200,000) (1,194,100,000)    
Other 0 0    
Total current assets (2,082,200,000) (1,194,100,000)    
PROPERTY AND EQUIPMENT, AT COST 0 0    
Less accumulated depreciation 0 0    
Property and equipment, net 0 0    
DUE FROM AFFILIATES (15,037,800,000) (15,479,100,000)    
INVESTMENTS IN AFFILIATES (7,978,800,000) (7,743,800,000)    
OTHER ASSETS, NET (159,200,000) (130,400,000)    
TOTAL ASSETS (25,258,000,000) (24,547,400,000)    
Accounts payable and accrued liabilities 0 0    
Accounts payable to affiliates (2,082,200,000) (1,194,100,000)    
Current maturities of long-term debt 0 0    
Total current liabilities (2,082,200,000) (1,194,100,000)    
Due to Affiliate, Noncurrent (15,037,800,000) (15,479,100,000)    
DUE TO AFFILIATES (1,598,300,000) (1,761,300,000)    
LONG-TERM DEBT 0 0    
OTHER LIABILITIES (159,200,000) (130,400,000)    
ENSCO SHAREHOLDERS' EQUITY (6,380,500,000) (5,982,500,000)    
NONCONTROLLING INTERESTS 0 0    
Total equity (6,380,500,000) (5,982,500,000)    
Total liabilities and shareholders' equity $ (25,258,000,000) $ (24,547,400,000)