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Guarantee Of Registered Securities (Condensed Consolidating Balance Sheets) (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Dec. 31, 2016
Guarantor Obligations [Line Items]        
Cash and cash equivalents $ 485.5 $ 445.4 $ 169.6 $ 1,159.7
Short-term investments 255.0 440.0    
Accounts receivable, net 332.7 345.4    
Accounts receivable from affiliates 0.0 0.0    
Other current assets 389.6 381.2    
Total current assets 1,462.8 1,612.0    
PROPERTY AND EQUIPMENT, AT COST 15,476.5 15,332.1    
Less accumulated depreciation 2,692.6 2,458.4    
Property and equipment, net 12,783.9 12,873.7 11,059.0  
DUE FROM AFFILIATES 0.0 0.0    
INVESTMENTS IN AFFILIATES 0.0 0.0    
OTHER ASSETS 93.9 140.2    
TOTAL ASSETS 14,340.6 14,625.9    
Accounts payable and accrued liabilities 549.8 758.5    
Accounts payable to affiliates 0.0 0.0    
Total current liabilities 549.8 758.5    
Due to Affiliate 0.0 0.0    
LONG-TERM DEBT 4,994.9 4,750.7    
OTHER LIABILITIES 362.0 386.7    
ENSCO SHAREHOLDERS' EQUITY 8,436.2 8,732.1    
NONCONTROLLING INTERESTS (2.3) (2.1)    
Total equity 8,433.9 8,730.0    
Total liabilities and shareholders' equity 14,340.6 14,625.9    
Ensco plc        
Guarantor Obligations [Line Items]        
Cash and cash equivalents 305.7 185.2 73.3 892.6
Short-term investments 255.0 440.0    
Accounts receivable, net 1.9 6.9    
Accounts receivable from affiliates 1,163.0 351.8    
Other current assets 0.3 0.0    
Total current assets 1,725.9 983.9    
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 3,080.5 3,002.1    
INVESTMENTS IN AFFILIATES 8,835.1 9,098.5    
OTHER ASSETS 9.7 12.9    
TOTAL ASSETS 13,651.2 13,097.4    
Accounts payable and accrued liabilities 79.7 55.4    
Accounts payable to affiliates 47.2 67.3    
Total current liabilities 126.9 122.7    
Due to Affiliate 1,417.2 1,402.9    
LONG-TERM DEBT 3,673.2 2,841.8    
OTHER LIABILITIES 0.0 0.0    
ENSCO SHAREHOLDERS' EQUITY 8,433.9 8,730.0    
NONCONTROLLING INTERESTS 0.0 0.0    
Total equity 8,433.9 8,730.0    
Total liabilities and shareholders' equity 13,651.2 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 0.4 0.4    
Accounts receivable from affiliates 413.4 492.7    
Other current assets 2.1 8.8    
Total current assets 415.9 501.9    
PROPERTY AND EQUIPMENT, AT COST 124.4 120.8    
Less accumulated depreciation 84.1 77.1    
Property and equipment, net 40.3 43.7    
DUE FROM AFFILIATES 461.3 2,618.0    
INVESTMENTS IN AFFILIATES 3,641.4 3,591.9    
OTHER ASSETS 0.0 5.0    
TOTAL ASSETS 4,558.9 6,760.5    
Accounts payable and accrued liabilities 10.0 39.0    
Accounts payable to affiliates 374.9 458.3    
Total current liabilities 384.9 497.3    
Due to Affiliate 1,426.1 3,559.2    
LONG-TERM DEBT 149.4 149.2    
OTHER LIABILITIES 24.2 3.1    
ENSCO SHAREHOLDERS' EQUITY 2,574.3 2,551.7    
NONCONTROLLING INTERESTS 0.0 0.0    
Total equity 2,574.3 2,551.7    
Total liabilities and shareholders' equity 4,558.9 6,760.5    
Pride International LLC        
Guarantor Obligations [Line Items]        
Cash and cash equivalents 16.1 25.6 3.8 19.8
Short-term investments 0.0 0.0    
Accounts receivable, net 0.0 0.0    
Accounts receivable from affiliates 1.4 0.0    
Other current assets 0.0 0.0    
Total current assets 17.5 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 161.2 165.1    
INVESTMENTS IN AFFILIATES 1,152.6 1,106.6    
OTHER ASSETS 0.0 0.0    
TOTAL ASSETS 1,331.3 1,297.3    
Accounts payable and accrued liabilities 12.5 21.7    
Accounts payable to affiliates 27.1 12.4    
Total current liabilities 39.6 34.1    
Due to Affiliate 1,387.6 753.9    
LONG-TERM DEBT 504.8 1,106.0    
OTHER LIABILITIES 0.0 0.0    
ENSCO SHAREHOLDERS' EQUITY (600.7) (596.7)    
NONCONTROLLING INTERESTS 0.0 0.0    
Total equity (600.7) (596.7)    
Total liabilities and shareholders' equity 1,331.3 1,297.3    
Other Non-Guarantor Subsidiaries of Ensco        
Guarantor Obligations [Line Items]        
Cash and cash equivalents 163.7 234.6 92.5 247.3
Short-term investments 0.0 0.0    
Accounts receivable, net 330.4 338.1    
Accounts receivable from affiliates 386.2 424.3    
Other current assets 387.2 372.4    
Total current assets 1,267.5 1,369.4    
PROPERTY AND EQUIPMENT, AT COST 15,350.3 15,209.5    
Less accumulated depreciation 2,606.7 2,379.5    
Property and equipment, net 12,743.6 12,830.0    
DUE FROM AFFILIATES 2,185.4 3,736.1    
INVESTMENTS IN AFFILIATES 0.0 0.0    
OTHER ASSETS 204.1 226.5    
TOTAL ASSETS 16,400.6 18,162.0    
Accounts payable and accrued liabilities 447.6 642.4    
Accounts payable to affiliates 1,514.8 730.8    
Total current liabilities 1,962.4 1,373.2    
Due to Affiliate 1,657.5 3,805.3    
LONG-TERM DEBT 667.5 653.7    
OTHER LIABILITIES 457.7 487.8    
ENSCO SHAREHOLDERS' EQUITY 11,657.8 11,844.1    
NONCONTROLLING INTERESTS (2.3) (2.1)    
Total equity 11,655.5 11,842.0    
Total liabilities and shareholders' equity 16,400.6 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 (1,964.0) (1,268.8)    
Other current assets 0.0 0.0    
Total current assets (1,964.0) (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 (5,888.4) (9,521.3)    
INVESTMENTS IN AFFILIATES (13,629.1) (13,797.0)    
OTHER ASSETS (119.9) (104.2)    
TOTAL ASSETS (21,601.4) (24,691.3)    
Accounts payable and accrued liabilities 0.0 0.0    
Accounts payable to affiliates (1,964.0) (1,268.8)    
Total current liabilities (1,964.0) (1,268.8)    
Due to Affiliate (5,888.4) (9,521.3)    
LONG-TERM DEBT 0.0 0.0    
OTHER LIABILITIES (119.9) (104.2)    
ENSCO SHAREHOLDERS' EQUITY (13,629.1) (13,797.0)    
NONCONTROLLING INTERESTS 0.0 0.0    
Total equity (13,629.1) (13,797.0)    
Total liabilities and shareholders' equity $ (21,601.4) $ (24,691.3)