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Guarantee Of Registered Securities (Condensed Consolidating Statements Of Income) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Guarantor Obligations [Line Items]    
OPERATING REVENUES $ 1,149.9 $ 1,020.6
Contract drilling (exclusive of depreciation) 560.8 502.2
Depreciation 149.0 136.0
General and administrative 37.8 38.2
OPERATING INCOME 402.3 344.2
OTHER INCOME (EXPENSE), NET (29.8) (26.7)
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES 372.5 317.5
INCOME TAX PROVISION 51.7 37.0
DISCONTINUED OPERATIONS, NET (0.9) (13.1)
EQUITY EARNINGS IN AFFILIATES, NET OF TAX 0 0
NET INCOME 319.9 267.4
NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS (2.8) (2.0)
NET INCOME ATTRIBUTABLE TO ENSCO 317.1 265.4
Ensco Plc [Member]
   
Guarantor Obligations [Line Items]    
OPERATING REVENUES 5.5 21.9
Contract drilling (exclusive of depreciation) 12.4 6.9
Depreciation 0.1 0.1
General and administrative 16.9 14.6
OPERATING INCOME (23.9) 0.3
OTHER INCOME (EXPENSE), NET (14.6) (11.2)
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES (38.5) (10.9)
INCOME TAX PROVISION 0 0
DISCONTINUED OPERATIONS, NET 0 0
EQUITY EARNINGS IN AFFILIATES, NET OF TAX 355.6 276.3
NET INCOME 317.1 265.4
NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS 0 0
NET INCOME ATTRIBUTABLE TO ENSCO 317.1 265.4
ENSCO International Inc. [Member]
   
Guarantor Obligations [Line Items]    
OPERATING REVENUES 38.1 10.6
Contract drilling (exclusive of depreciation) 38.1 10.6
Depreciation 0.8 0.8
General and administrative 0.2 0
OPERATING INCOME (1.0) (0.8)
OTHER INCOME (EXPENSE), NET (7.4) (0.3)
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES (8.4) (1.1)
INCOME TAX PROVISION 29.5 11.2
DISCONTINUED OPERATIONS, NET 0 0
EQUITY EARNINGS IN AFFILIATES, NET OF TAX 111.7 44.2
NET INCOME 73.8 31.9
NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS 0 0
NET INCOME ATTRIBUTABLE TO ENSCO 73.8 31.9
Pride International, Inc. [Member]
   
Guarantor Obligations [Line Items]    
OPERATING REVENUES 0 0
Contract drilling (exclusive of depreciation) 0 0
Depreciation 0 0
General and administrative 0 0
OPERATING INCOME 0 0
OTHER INCOME (EXPENSE), NET (14.6) (11.7)
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES (14.6) (11.7)
INCOME TAX PROVISION 0 0
DISCONTINUED OPERATIONS, NET 0 0
EQUITY EARNINGS IN AFFILIATES, NET OF TAX 52.4 79.7
NET INCOME 37.8 68.0
NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS 0 0
NET INCOME ATTRIBUTABLE TO ENSCO 37.8 68.0
Other Non-Guarantor Subsidiaries Of Ensco [Member]
   
Guarantor Obligations [Line Items]    
OPERATING REVENUES 1,183.7 1,037.0
Contract drilling (exclusive of depreciation) 587.7 533.6
Depreciation 148.1 135.1
General and administrative 20.7 23.6
OPERATING INCOME 427.2 344.7
OTHER INCOME (EXPENSE), NET 6.8 (3.5)
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES 434.0 341.2
INCOME TAX PROVISION 22.2 25.8
DISCONTINUED OPERATIONS, NET (0.9) (13.1)
EQUITY EARNINGS IN AFFILIATES, NET OF TAX 0 0
NET INCOME 410.9 302.3
NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS (2.8) (2.0)
NET INCOME ATTRIBUTABLE TO ENSCO 408.1 300.3
Consolidating Adjustments [Member]
   
Guarantor Obligations [Line Items]    
OPERATING REVENUES (77.4) (48.9)
Contract drilling (exclusive of depreciation) (77.4) (48.9)
Depreciation 0 0
General and administrative 0 0
OPERATING INCOME 0 0
OTHER INCOME (EXPENSE), NET 0 0
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES 0 0
INCOME TAX PROVISION 0 0
DISCONTINUED OPERATIONS, NET 0 0
EQUITY EARNINGS IN AFFILIATES, NET OF TAX (519.7) (400.2)
NET INCOME (519.7) (400.2)
NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS 0 0
NET INCOME ATTRIBUTABLE TO ENSCO $ (519.7) $ (400.2)