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Guarantee Of Registered Securities (Condensed Consolidating Statements Of Income) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Guarantor Obligations [Line Items]        
OPERATING REVENUES $ 548.2 $ 1,012.2 $ 2,271.8 $ 3,235.1
Contract drilling (exclusive of depreciation) 298.1 433.5 1,012.0 1,454.4
Depreciation 109.4 145.2 335.1 422.8
Loss on impairment 0.0 2.4 0.0 2.4
General and administrative 25.3 28.4 76.1 88.2
OPERATING INCOME 115.4 402.7 848.6 1,267.3
OTHER INCOME (EXPENSE), NET (30.9) (52.4) 114.4 (180.4)
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES 84.5 350.3 963.0 1,086.9
INCOME TAX PROVISION (3.5) 33.2 104.6 168.9
DISCONTINUED OPERATIONS, NET (0.7) (23.3) (1.8) (33.6)
NET INCOME 87.3 293.8 856.6 884.4
NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS (2.0) (1.8) (5.4) (7.4)
NET INCOME ATTRIBUTABLE TO ENSCO 85.3 292.0 851.2 877.0
Ensco Plc [Member]        
Guarantor Obligations [Line Items]        
OPERATING REVENUES 6.7 9.8 21.5 27.2
Contract drilling (exclusive of depreciation) 6.7 7.3 20.6 20.4
Depreciation 0.0   0.0 0.1
Loss on impairment   0.0   0.0
General and administrative 9.1 11.8 25.8 38.8
OPERATING INCOME (9.1) (9.3) (24.9) (32.1)
OTHER INCOME (EXPENSE), NET 6.9 (37.1) 145.9 (133.3)
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES (2.2) (46.4) 121.0 (165.4)
INCOME TAX PROVISION     0.0  
DISCONTINUED OPERATIONS, NET     0.0  
EQUITY EARNINGS IN AFFILIATES, NET OF TAX 87.5 338.4 730.2 1,042.4
NET INCOME 85.3 292.0 851.2 877.0
NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS     0.0  
NET INCOME ATTRIBUTABLE TO ENSCO 85.3 292.0 851.2 877.0
ENSCO International Inc. [Member]        
Guarantor Obligations [Line Items]        
OPERATING REVENUES 36.1 34.8 108.2 104.1
Contract drilling (exclusive of depreciation) 36.5 34.8 108.6 104.1
Depreciation 4.2 4.3 12.9 9.2
Loss on impairment   0.0   0.0
General and administrative 0.1 0.1 0.2 0.2
OPERATING INCOME (4.7) (4.4) (13.5) (9.4)
OTHER INCOME (EXPENSE), NET (32.5) (7.2) (39.2) (21.6)
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES (37.2) (11.6) (52.7) (31.0)
INCOME TAX PROVISION (3.5) 0.9 11.9 28.8
DISCONTINUED OPERATIONS, NET     0.0  
EQUITY EARNINGS IN AFFILIATES, NET OF TAX 60.2 111.2 113.7 203.9
NET INCOME 26.5 98.7 49.1 144.1
NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS     0.0  
NET INCOME ATTRIBUTABLE TO ENSCO 26.5 98.7 49.1 144.1
Pride International, Inc. [Member]        
Guarantor Obligations [Line Items]        
OPERATING REVENUES 0.0   0.0  
Contract drilling (exclusive of depreciation)     0.0  
Depreciation     0.0  
Loss on impairment   0.0   0.0
General and administrative 0.0   0.0  
OPERATING INCOME 0.0   0.0  
OTHER INCOME (EXPENSE), NET (18.9) (15.7) (56.8) (46.8)
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES (18.9) (15.7) (56.8) (46.8)
INCOME TAX PROVISION (0.6)   (0.6)  
DISCONTINUED OPERATIONS, NET     0.0  
EQUITY EARNINGS IN AFFILIATES, NET OF TAX 23.2 14.6 87.0 149.9
NET INCOME 4.9 (1.1) 30.8 103.1
NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS     0.0  
NET INCOME ATTRIBUTABLE TO ENSCO 4.9 (1.1) 30.8 103.1
Other Non-Guarantor Subsidiaries Of Ensco [Member]        
Guarantor Obligations [Line Items]        
OPERATING REVENUES 581.0 1,039.4 2,361.7 3,317.6
Contract drilling (exclusive of depreciation) 330.5 463.2 1,102.4 1,543.7
Depreciation 105.2 140.9 322.2 413.5
Loss on impairment   2.4   2.4
General and administrative 16.1 16.5 50.1 49.2
OPERATING INCOME 129.2 416.4 887.0 1,308.8
OTHER INCOME (EXPENSE), NET 7.8 7.6 (1.2) 21.3
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES 137.0 424.0 885.8 1,330.1
INCOME TAX PROVISION 0.6 32.3 93.3 140.1
DISCONTINUED OPERATIONS, NET (0.7) (23.3) (1.8) (33.6)
NET INCOME 135.7 368.4 790.7 1,156.4
NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS (2.0) (1.8) (5.4) (7.4)
NET INCOME ATTRIBUTABLE TO ENSCO 133.7 366.6 785.3 1,149.0
Consolidating Adjustments [Member]        
Guarantor Obligations [Line Items]        
OPERATING REVENUES (75.6) (71.8) (219.6) (213.8)
Contract drilling (exclusive of depreciation) (75.6) (71.8) (219.6) (213.8)
Depreciation     0.0  
Loss on impairment   0.0   0.0
General and administrative     0.0  
OPERATING INCOME     0.0  
OTHER INCOME (EXPENSE), NET 5.8   65.7  
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES 5.8   65.7  
INCOME TAX PROVISION     0.0  
DISCONTINUED OPERATIONS, NET     0.0  
EQUITY EARNINGS IN AFFILIATES, NET OF TAX (170.9) (464.2) (930.9) (1,396.2)
NET INCOME (165.1) (464.2) (865.2) (1,396.2)
NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS     0.0  
NET INCOME ATTRIBUTABLE TO ENSCO $ (165.1) $ (464.2) $ (865.2) $ (1,396.2)