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Guarantee Of Registered Securities (Condensed Consolidating Statements Of Income) (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Guarantor Obligations [Line Items]                      
OPERATING REVENUES $ 828.3 $ 1,012.2 $ 1,059.0 $ 1,163.9 $ 1,159.8 $ 1,201.4 $ 1,136.6 $ 1,066.7 $ 4,063.4 $ 4,564.5 $ 4,323.4
Contract drilling (exclusive of depreciation) 415.2 433.5 502.6 518.3 514.0 500.2 542.5 520.2 1,869.6 2,076.9 1,947.1
Asset Impairment Charges 2,744.0 2.4 0.0 0.0 3,515.2 0.0 703.5 0.0 2,746.4 4,218.7 0.0
Depreciation 149.7 145.2 140.5 137.1 139.4 135.2 132.2 131.1 572.5 537.9 496.2
General and administrative 30.2 28.4 29.7 30.1 28.3 29.3 36.2 38.1 118.4 131.9 146.8
OPERATING INCOME (2,510.8) 402.7 386.2 478.4 (3,037.1) 536.7 (277.8) 377.3 (1,243.5) (2,400.9) 1,733.3
OTHER (EXPENSE) INCOME, NET (47.3) (52.4) (55.4) (72.6) (49.6) (38.4) (30.8) (29.1) (227.7) (147.9) (100.1)
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES (2,558.1) 350.3 330.8 405.8 (3,086.7) 498.3 (308.6) 348.2 (1,471.2) (2,548.8) 1,633.2
Total provision for income taxes (182.8) 33.2 58.0 77.7 (26.2) 74.6 42.6 49.5 (13.9) 140.5 203.1
DISCONTINUED OPERATIONS, NET (95.0) (23.3) (10.1) (0.2) (388.0) 9.2 (818.4) (2.0) (128.6) (1,199.2) (2.2)
EQUITY EARNINGS IN AFFILIATES, NET OF TAX                 0.0 0.0 0.0
NET INCOME (2,470.3) 293.8 262.7 327.9 (3,448.5) 432.9 (1,169.6) 296.7 (1,585.9) (3,888.5) 1,427.9
NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS (1.5) (1.8) (2.4) (3.2) (3.3) (3.5) (3.1) (4.2) (8.9) (14.1) (9.7)
NET INCOME ATTRIBUTABLE TO ENSCO $ (2,471.8) $ 292.0 $ 260.3 $ 324.7 $ (3,451.8) $ 429.4 $ (1,172.7) $ 292.5 (1,594.8) (3,902.6) 1,418.2
Ensco Plc [Member]                      
Guarantor Obligations [Line Items]                      
OPERATING REVENUES                 31.7 34.5 35.0
Contract drilling (exclusive of depreciation)                 29.2 31.8 27.5
Asset Impairment Charges                 0.0 0.0  
Depreciation                 0.1 0.2 0.3
General and administrative                 51.5 52.0 63.5
OPERATING INCOME                 (49.1) (49.5) (56.3)
OTHER (EXPENSE) INCOME, NET                 (169.5) (67.0) (65.6)
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES                 (218.6) (116.5) (121.9)
Total provision for income taxes                 0.0 0.0 0.0
DISCONTINUED OPERATIONS, NET                 0.0 0.0 0.0
EQUITY EARNINGS IN AFFILIATES, NET OF TAX                 (1,376.2) (3,786.1) 1,540.1
NET INCOME                 (1,594.8) (3,902.6) 1,418.2
NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS                 0.0 0.0 0.0
NET INCOME ATTRIBUTABLE TO ENSCO                 (1,594.8) (3,902.6) 1,418.2
ENSCO International Inc. [Member]                      
Guarantor Obligations [Line Items]                      
OPERATING REVENUES                 163.5 145.4 149.4
Contract drilling (exclusive of depreciation)                 163.5 145.4 149.4
Asset Impairment Charges                 0.0 0.0  
Depreciation                 13.8 7.6 4.0
General and administrative                 0.2 0.4 0.5
OPERATING INCOME                 (14.0) (8.0) (4.5)
OTHER (EXPENSE) INCOME, NET                 (28.6) (43.3) (9.4)
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES                 (42.6) (51.3) (13.9)
Total provision for income taxes                 (190.6) (44.9) 92.5
DISCONTINUED OPERATIONS, NET                 0.0 0.0 0.0
EQUITY EARNINGS IN AFFILIATES, NET OF TAX                 (1,672.8) (3,651.0) 366.2
NET INCOME                 (1,524.8) (3,657.4) 259.8
NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS                 0.0 0.0 0.0
NET INCOME ATTRIBUTABLE TO ENSCO                 (1,524.8) (3,657.4) 259.8
Pride International Inc. [Member]                      
Guarantor Obligations [Line Items]                      
OPERATING REVENUES                 0.0 0.0 0.0
Contract drilling (exclusive of depreciation)                 0.0 0.0 0.0
Asset Impairment Charges                 0.0 0.0  
Depreciation                 0.0 0.0 0.0
General and administrative                 0.0 0.0 0.0
OPERATING INCOME                 0.0 0.0 0.0
OTHER (EXPENSE) INCOME, NET                 (71.5) (54.7) (27.9)
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES                 (71.5) (54.7) (27.9)
Total provision for income taxes                 0.0 0.0 0.0
DISCONTINUED OPERATIONS, NET                 0.0 0.0 0.0
EQUITY EARNINGS IN AFFILIATES, NET OF TAX                 (1,771.5) (3,744.3) 111.6
NET INCOME                 (1,843.0) (3,799.0) 83.7
NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS                 0.0 0.0 0.0
NET INCOME ATTRIBUTABLE TO ENSCO                 (1,843.0) (3,799.0) 83.7
Other Non-Guarantor Subsidiaries Of Ensco [Member]                      
Guarantor Obligations [Line Items]                      
OPERATING REVENUES                 4,199.4 4,683.0 4,446.4
Contract drilling (exclusive of depreciation)                 2,008.1 2,198.1 2,077.6
Asset Impairment Charges                 2,746.4 4,218.7  
Depreciation                 558.6 530.1 491.9
General and administrative                 66.7 79.5 82.8
OPERATING INCOME                 (1,180.4) (2,343.4) 1,794.1
OTHER (EXPENSE) INCOME, NET                 41.9 17.1 2.8
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES                 (1,138.5) (2,326.3) 1,796.9
Total provision for income taxes                 176.7 185.4 110.6
DISCONTINUED OPERATIONS, NET                 (128.6) (1,199.2) (2.2)
EQUITY EARNINGS IN AFFILIATES, NET OF TAX                 0.0 0.0 0.0
NET INCOME                 (1,443.8) (3,710.9) 1,684.1
NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS                 (8.9) (14.1) (9.7)
NET INCOME ATTRIBUTABLE TO ENSCO                 (1,452.7) (3,725.0) 1,674.4
Consolidating Adjustments [Member]                      
Guarantor Obligations [Line Items]                      
OPERATING REVENUES                 (331.2) (298.4) (307.4)
Contract drilling (exclusive of depreciation)                 (331.2) (298.4) (307.4)
Asset Impairment Charges                 0.0 0.0  
Depreciation                 0.0 0.0 0.0
General and administrative                 0.0 0.0 0.0
OPERATING INCOME                 0.0 0.0 0.0
OTHER (EXPENSE) INCOME, NET                 0.0 0.0 0.0
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES                 0.0 0.0 0.0
Total provision for income taxes                 0.0 0.0 0.0
DISCONTINUED OPERATIONS, NET                 0.0 0.0 0.0
EQUITY EARNINGS IN AFFILIATES, NET OF TAX                 4,820.5 11,181.4 (2,017.9)
NET INCOME                 4,820.5 11,181.4 (2,017.9)
NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS                 0.0 0.0 0.0
NET INCOME ATTRIBUTABLE TO ENSCO                 $ 4,820.5 $ 11,181.4 $ (2,017.9)