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Guarantee Of Registered Securities (Condensed Consolidating Statements Of Income) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Guarantor Obligations [Line Items]        
OPERATING REVENUES $ 457.5 $ 909.6 $ 928.6 $ 1,723.6
Contract drilling (exclusive of depreciation) 291.3 350.2 569.4 713.9
Depreciation 107.9 112.4 217.1 225.7
General and administrative 30.5 27.4 56.5 50.8
OPERATING INCOME 27.8 419.6 85.6 733.2
OTHER INCOME (EXPENSE), NET (53.2) 209.9 (110.9) 145.3
(LOSS) INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES (25.4) 629.5 (25.3) 878.5
INCOME TAX PROVISION 19.3 36.7 43.4 108.1
DISCONTINUED OPERATIONS, NET 0.4 (0.2) (0.2) (1.1)
EQUITY EARNINGS IN AFFILIATES, NET OF TAX 0.0 0.0 0.0 0.0
NET (LOSS) INCOME (44.3) 592.6 (68.9) 769.3
NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS (1.2) (2.0) (2.3) (3.4)
NET (LOSS) INCOME ATTRIBUTABLE TO ENSCO (45.5) 590.6 (71.2) 765.9
Ensco Plc [Member]        
Guarantor Obligations [Line Items]        
OPERATING REVENUES 12.8 7.6 25.5 14.8
Contract drilling (exclusive of depreciation) 11.1 6.7 22.4 13.9
Depreciation 0.0 0.0 0.0 0.0
General and administrative 12.1 10.5 23.6 16.7
OPERATING INCOME (10.4) (9.6) (20.5) (15.8)
OTHER INCOME (EXPENSE), NET (7.1) 175.8 (13.6) 139.0
(LOSS) INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES (17.5) 166.2 (34.1) 123.2
INCOME TAX PROVISION 0.0 0.0 0.0 0.0
DISCONTINUED OPERATIONS, NET 0.0 0.0 0.0 0.0
EQUITY EARNINGS IN AFFILIATES, NET OF TAX (28.0) 424.4 (37.1) 642.7
NET (LOSS) INCOME (45.5) 590.6 (71.2) 765.9
NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS 0.0 0.0 0.0 0.0
NET (LOSS) INCOME ATTRIBUTABLE TO ENSCO (45.5) 590.6 (71.2) 765.9
ENSCO International Inc. [Member]        
Guarantor Obligations [Line Items]        
OPERATING REVENUES 43.9 36.5 89.9 72.1
Contract drilling (exclusive of depreciation) 41.4 36.4 83.4 72.1
Depreciation 4.3 4.4 8.5 8.7
General and administrative 4.2 0.0 4.3 0.1
OPERATING INCOME (6.0) (4.3) (6.3) (8.8)
OTHER INCOME (EXPENSE), NET (26.9) (8.3) (58.2) (6.7)
(LOSS) INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES (32.9) (12.6) (64.5) (15.5)
INCOME TAX PROVISION 4.3 (15.6) 18.9 15.4
DISCONTINUED OPERATIONS, NET 0.0 0.0 0.0 0.0
EQUITY EARNINGS IN AFFILIATES, NET OF TAX 28.7 20.0 83.6 53.5
NET (LOSS) INCOME (8.5) 23.0 0.2 22.6
NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS 0.0 0.0 0.0 0.0
NET (LOSS) INCOME ATTRIBUTABLE TO ENSCO (8.5) 23.0 0.2 22.6
Pride International, Inc. [Member]        
Guarantor Obligations [Line Items]        
OPERATING REVENUES 0.0 0.0 0.0 0.0
Contract drilling (exclusive of depreciation) 0.0 0.0 0.0 0.0
Depreciation 0.0 0.0 0.0 0.0
General and administrative 0.0 0.0 0.0 0.0
OPERATING INCOME 0.0 0.0 0.0 0.0
OTHER INCOME (EXPENSE), NET (16.9) (18.8) (35.6) (37.9)
(LOSS) INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES (16.9) (18.8) (35.6) (37.9)
INCOME TAX PROVISION 0.0 0.0 0.0 0.0
DISCONTINUED OPERATIONS, NET 0.0 0.0 0.0 0.0
EQUITY EARNINGS IN AFFILIATES, NET OF TAX 19.9 10.2 46.2 63.8
NET (LOSS) INCOME 3.0 (8.6) 10.6 25.9
NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS 0.0 0.0 0.0 0.0
NET (LOSS) INCOME ATTRIBUTABLE TO ENSCO 3.0 (8.6) 10.6 25.9
Other Non-Guarantor Subsidiaries Of Ensco [Member]        
Guarantor Obligations [Line Items]        
OPERATING REVENUES 486.5 937.4 987.2 1,780.7
Contract drilling (exclusive of depreciation) 324.5 379.0 637.6 771.9
Depreciation 103.6 108.0 208.6 217.0
General and administrative 14.2 16.9 28.6 34.0
OPERATING INCOME 44.2 433.5 112.4 757.8
OTHER INCOME (EXPENSE), NET (4.9) 1.3 (12.6) (9.0)
(LOSS) INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES 39.3 434.8 99.8 748.8
INCOME TAX PROVISION 15.0 52.3 24.5 92.7
DISCONTINUED OPERATIONS, NET 0.4 (0.2) (0.2) (1.1)
EQUITY EARNINGS IN AFFILIATES, NET OF TAX 0.0 0.0 0.0 0.0
NET (LOSS) INCOME 24.7 382.3 75.1 655.0
NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS (1.2) (2.0) (2.3) (3.4)
NET (LOSS) INCOME ATTRIBUTABLE TO ENSCO 23.5 380.3 72.8 651.6
Consolidating Adjustments [Member]        
Guarantor Obligations [Line Items]        
OPERATING REVENUES (85.7) (71.9) (174.0) (144.0)
Contract drilling (exclusive of depreciation) (85.7) (71.9) (174.0) (144.0)
Depreciation 0.0 0.0 0.0 0.0
General and administrative 0.0 0.0 0.0 0.0
OPERATING INCOME 0.0 0.0 0.0 0.0
OTHER INCOME (EXPENSE), NET 2.6 59.9 9.1 59.9
(LOSS) INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES 2.6 59.9 9.1 59.9
INCOME TAX PROVISION 0.0 0.0 0.0 0.0
DISCONTINUED OPERATIONS, NET 0.0 0.0 0.0 0.0
EQUITY EARNINGS IN AFFILIATES, NET OF TAX (20.6) (454.6) (92.7) (760.0)
NET (LOSS) INCOME (18.0) (394.7) (83.6) (700.1)
NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS 0.0 0.0 0.0 0.0
NET (LOSS) INCOME ATTRIBUTABLE TO ENSCO $ (18.0) $ (394.7) $ (83.6) $ (700.1)