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Guarantee Of Registered Securities (Condensed Consolidating Statements Of Income) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Guarantor Obligations [Line Items]    
OPERATING REVENUES $ 417.0 $ 471.1
Contract drilling (exclusive of depreciation) 325.2 278.1
Depreciation 115.2 109.2
General and administrative 27.9 26.0
OPERATING INCOME (LOSS) (51.3) 57.8
OTHER INCOME (EXPENSE), NET (70.7) (57.7)
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES (122.0) 0.1
INCOME TAX PROVISION 18.4 24.1
DISCONTINUED OPERATIONS, NET (0.1) (0.6)
EQUITY IN EARNINGS (LOSSES) OF AFFILIATES, NET OF TAX 0.0 0.0
NET LOSS (140.5) (24.6)
NET LOSS ATTRIBUTABLE TO NONCONTROLLING INTERESTS 0.4 (1.1)
NET LOSS ATTRIBUTABLE TO ENSCO (140.1) (25.7)
Ensco Plc [Member]    
Guarantor Obligations [Line Items]    
OPERATING REVENUES 12.3 12.7
Contract drilling (exclusive of depreciation) 13.4 11.3
Depreciation 0.0 0.0
General and administrative 10.2 11.5
OPERATING INCOME (LOSS) (11.3) (10.1)
OTHER INCOME (EXPENSE), NET 5.6 (6.5)
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES (5.7) (16.6)
INCOME TAX PROVISION 0.0 0.0
DISCONTINUED OPERATIONS, NET 0.0 0.0
EQUITY IN EARNINGS (LOSSES) OF AFFILIATES, NET OF TAX (134.4) (9.1)
NET LOSS (140.1) (25.7)
NET LOSS ATTRIBUTABLE TO NONCONTROLLING INTERESTS 0.0 0.0
NET LOSS ATTRIBUTABLE TO ENSCO (140.1) (25.7)
ENSCO International Inc. [Member]    
Guarantor Obligations [Line Items]    
OPERATING REVENUES 40.3 46.0
Contract drilling (exclusive of depreciation) 36.6 42.0
Depreciation 3.5 4.2
General and administrative 0.2 0.1
OPERATING INCOME (LOSS) 0.0 (0.3)
OTHER INCOME (EXPENSE), NET (28.0) (31.3)
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES (28.0) (31.6)
INCOME TAX PROVISION 4.3 14.6
DISCONTINUED OPERATIONS, NET 0.0 0.0
EQUITY IN EARNINGS (LOSSES) OF AFFILIATES, NET OF TAX 20.8 54.9
NET LOSS (11.5) 8.7
NET LOSS ATTRIBUTABLE TO NONCONTROLLING INTERESTS 0.0 0.0
NET LOSS ATTRIBUTABLE TO ENSCO (11.5) 8.7
Pride International, Inc. [Member]    
Guarantor Obligations [Line Items]    
OPERATING REVENUES 0.0 0.0
Contract drilling (exclusive of depreciation) 0.0 0.0
Depreciation 0.0 0.0
General and administrative 0.0 0.0
OPERATING INCOME (LOSS) 0.0 0.0
OTHER INCOME (EXPENSE), NET (30.3) (18.7)
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES (30.3) (18.7)
INCOME TAX PROVISION 0.0 0.0
DISCONTINUED OPERATIONS, NET 0.0 0.0
EQUITY IN EARNINGS (LOSSES) OF AFFILIATES, NET OF TAX 23.4 26.3
NET LOSS (6.9) 7.6
NET LOSS ATTRIBUTABLE TO NONCONTROLLING INTERESTS 0.0 0.0
NET LOSS ATTRIBUTABLE TO ENSCO (6.9) 7.6
Other Non-Guarantor Subsidiaries Of Ensco [Member]    
Guarantor Obligations [Line Items]    
OPERATING REVENUES 443.5 500.7
Contract drilling (exclusive of depreciation) 354.3 313.1
Depreciation 111.7 105.0
General and administrative 17.5 14.4
OPERATING INCOME (LOSS) (40.0) 68.2
OTHER INCOME (EXPENSE), NET (33.4) (7.7)
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES (73.4) 60.5
INCOME TAX PROVISION 14.1 9.5
DISCONTINUED OPERATIONS, NET (0.1) (0.6)
EQUITY IN EARNINGS (LOSSES) OF AFFILIATES, NET OF TAX 0.0 0.0
NET LOSS (87.6) 50.4
NET LOSS ATTRIBUTABLE TO NONCONTROLLING INTERESTS 0.4 (1.1)
NET LOSS ATTRIBUTABLE TO ENSCO (87.2) 49.3
Consolidating Adjustments [Member]    
Guarantor Obligations [Line Items]    
OPERATING REVENUES (79.1) (88.3)
Contract drilling (exclusive of depreciation) (79.1) (88.3)
Depreciation 0.0 0.0
General and administrative 0.0 0.0
OPERATING INCOME (LOSS) 0.0 0.0
OTHER INCOME (EXPENSE), NET 15.4 6.5
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES 15.4 6.5
INCOME TAX PROVISION 0.0 0.0
DISCONTINUED OPERATIONS, NET 0.0 0.0
EQUITY IN EARNINGS (LOSSES) OF AFFILIATES, NET OF TAX 90.2 (72.1)
NET LOSS 105.6 (65.6)
NET LOSS ATTRIBUTABLE TO NONCONTROLLING INTERESTS 0.0 0.0
NET LOSS ATTRIBUTABLE TO ENSCO $ 105.6 $ (65.6)