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Guarantee Of Registered Securities (Condensed Consolidating Balance Sheets) (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Guarantor Obligations [Line Items]        
Cash and cash equivalents $ 275.1 $ 445.4 $ 1,159.7 $ 121.3
Short-term Investments 329.0 440.0    
Accounts receivable 344.7 345.4    
Accounts receivable from affiliates 0.0 0.0    
Other 360.9 381.2    
Total current assets 1,309.7 1,612.0    
PROPERTY AND EQUIPMENT, AT COST 15,517.0 15,332.1    
Less accumulated depreciation 2,900.8 2,458.4    
Property and equipment, net 12,616.2 12,873.7 10,919.3  
DUE FROM AFFILIATES 0.0 0.0    
INVESTMENTS IN AFFILIATES 0.0 0.0    
OTHER ASSETS, NET 97.8 140.2    
TOTAL ASSETS 14,023.7 14,625.9    
Accounts payable and accrued liabilities 528.5 758.5    
Accounts payable to affiliates 0.0 0.0    
Total current liabilities 528.5 758.5    
DUE TO AFFILIATES 0.0 0.0    
LONG-TERM DEBT 5,010.4 4,750.7    
OTHER LIABILITIES 396.0 386.7    
ENSCO SHAREHOLDERS' EQUITY 8,091.4 8,732.1    
NONCONTROLLING INTERESTS (2.6) (2.1)    
Total equity 8,088.8 8,730.0    
Total liabilities and shareholders' equity 14,023.7 14,625.9    
Ensco Plc [Member]        
Guarantor Obligations [Line Items]        
Cash and cash equivalents 199.8 185.2 892.6 94.0
Short-term Investments 329.0 440.0    
Accounts receivable 7.3 6.9    
Accounts receivable from affiliates 1,861.2 351.8    
Other 0.6 0.0    
Total current assets 2,397.9 983.9    
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 2,413.8 3,002.1    
INVESTMENTS IN AFFILIATES 8,522.6 9,098.5    
OTHER ASSETS, NET 8.1 12.9    
TOTAL ASSETS 13,342.4 13,097.4    
Accounts payable and accrued liabilities 85.3 55.4    
Accounts payable to affiliates 59.7 67.3    
Total current liabilities 145.0 122.7    
DUE TO AFFILIATES 1,432.0 1,402.9    
LONG-TERM DEBT 3,676.5 2,841.8    
OTHER LIABILITIES 0.1 0.0    
ENSCO SHAREHOLDERS' EQUITY 8,088.8 8,730.0    
NONCONTROLLING INTERESTS 0.0 0.0    
Total equity 8,088.8 8,730.0    
Total liabilities and shareholders' equity 13,342.4 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 25.4 0.4    
Accounts receivable from affiliates 171.4 492.7    
Other 6.0 8.8    
Total current assets 202.8 501.9    
PROPERTY AND EQUIPMENT, AT COST 125.2 120.8    
Less accumulated depreciation 91.3 77.1    
Property and equipment, net 33.9 43.7    
DUE FROM AFFILIATES 234.5 2,618.0    
INVESTMENTS IN AFFILIATES 3,713.7 3,591.9    
OTHER ASSETS, NET 0.0 5.0    
TOTAL ASSETS 4,184.9 6,760.5    
Accounts payable and accrued liabilities 32.0 39.0    
Accounts payable to affiliates 139.5 458.3    
Total current liabilities 171.5 497.3    
DUE TO AFFILIATES 1,226.9 3,559.2    
LONG-TERM DEBT 149.3 149.2    
OTHER LIABILITIES 64.3 3.1    
ENSCO SHAREHOLDERS' EQUITY 2,572.9 2,551.7    
NONCONTROLLING INTERESTS 0.0 0.0    
Total equity 2,572.9 2,551.7    
Total liabilities and shareholders' equity 4,184.9 6,760.5    
Pride International Inc. [Member]        
Guarantor Obligations [Line Items]        
Cash and cash equivalents 2.7 25.6 19.8 2.0
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 2.7 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 125.0 165.1    
INVESTMENTS IN AFFILIATES 1,199.9 1,106.6    
OTHER ASSETS, NET 0.0 0.0    
TOTAL ASSETS 1,327.6 1,297.3    
Accounts payable and accrued liabilities 12.7 21.7    
Accounts payable to affiliates 38.2 12.4    
Total current liabilities 50.9 34.1    
DUE TO AFFILIATES 1,366.5 753.9    
LONG-TERM DEBT 502.6 1,106.0    
OTHER LIABILITIES 0.0 0.0    
ENSCO SHAREHOLDERS' EQUITY (592.4) (596.7)    
NONCONTROLLING INTERESTS 0.0 0.0    
Total equity (592.4) (596.7)    
Total liabilities and shareholders' equity 1,327.6 1,297.3    
Other Non-Guarantor Subsidiaries Of Ensco [Member]        
Guarantor Obligations [Line Items]        
Cash and cash equivalents 72.6 234.6 247.3 25.3
Short-term Investments 0.0 0.0    
Accounts receivable 312.0 338.1    
Accounts receivable from affiliates 131.7 424.3    
Other 354.3 372.4    
Total current assets 870.6 1,369.4    
PROPERTY AND EQUIPMENT, AT COST 15,390.0 15,209.5    
Less accumulated depreciation 2,807.7 2,379.5    
Property and equipment, net 12,582.3 12,830.0    
DUE FROM AFFILIATES 2,715.1 3,736.1    
INVESTMENTS IN AFFILIATES 0.0 0.0    
OTHER ASSETS, NET 89.7 226.5    
TOTAL ASSETS 16,257.7 18,162.0    
Accounts payable and accrued liabilities 398.5 642.4    
Accounts payable to affiliates 1,926.9 730.8    
Total current liabilities 2,325.4 1,373.2    
DUE TO AFFILIATES 1,463.0 3,805.3    
LONG-TERM DEBT 682.0 653.7    
OTHER LIABILITIES 331.6 487.8    
ENSCO SHAREHOLDERS' EQUITY 11,458.3 11,844.1    
NONCONTROLLING INTERESTS (2.6) (2.1)    
Total equity 11,455.7 11,842.0    
Total liabilities and shareholders' equity 16,257.7 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 0.0 0.0    
Accounts receivable from affiliates (2,164.3) (1,268.8)    
Other 0.0 0.0    
Total current assets (2,164.3) (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 (5,488.4) (9,521.3)    
INVESTMENTS IN AFFILIATES (13,436.2) (13,797.0)    
OTHER ASSETS, NET 0.0 (104.2)    
TOTAL ASSETS (21,088.9) (24,691.3)    
Accounts payable and accrued liabilities 0.0 0.0    
Accounts payable to affiliates (2,164.3) (1,268.8)    
Total current liabilities (2,164.3) (1,268.8)    
DUE TO AFFILIATES (5,488.4) (9,521.3)    
LONG-TERM DEBT 0.0 0.0    
OTHER LIABILITIES 0.0 (104.2)    
ENSCO SHAREHOLDERS' EQUITY (13,436.2) (13,797.0)    
NONCONTROLLING INTERESTS 0.0 0.0    
Total equity (13,436.2) (13,797.0)    
Total liabilities and shareholders' equity $ (21,088.9) $ (24,691.3)