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Guarantee Of Registered Securities (Condensed Consolidating Statements Of Income) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2016
Jun. 30, 2016
Dec. 31, 2015
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2016
Dec. 31, 2015
Guarantor Obligations [Line Items]                
OPERATING REVENUES   $ 909.6   $ 1,059.0 $ 1,723.6 $ 2,222.9    
Contract drilling (exclusive of depreciation)   350.2   502.6 713.9 1,020.9    
Depreciation   112.4   140.5 225.7 277.6    
General and administrative   27.4   29.7 50.8 59.8    
OPERATING (LOSS) INCOME   419.6   386.2 733.2 864.6    
OTHER INCOME (EXPENSE), NET   209.9   (55.4) 145.3 (128.0)    
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES   629.5   330.8 878.5 736.6    
INCOME TAX PROVISION   36.7   58.0 108.1 135.7    
DISCONTINUED OPERATIONS, NET $ (0.2) (0.2) $ (10.1) (10.1) (1.1) (10.3) $ (1.1) $ (10.3)
NET INCOME   592.6   262.7 769.3 590.6    
NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS   (2.0)   (2.4) (3.4) (5.6)    
NET INCOME ATTRIBUTABLE TO ENSCO   590.6   260.3 765.9 585.0    
Ensco Plc [Member]                
Guarantor Obligations [Line Items]                
OPERATING REVENUES   7.6   8.7 14.8 17.4    
Contract drilling (exclusive of depreciation)   6.7   6.3 13.9 13.1    
Depreciation   0.0     0.0 0.1    
General and administrative   10.5   13.7 16.7 27.0    
OPERATING (LOSS) INCOME   (9.6)   (11.3) (15.8) (22.8)    
OTHER INCOME (EXPENSE), NET   175.8   (36.3) 139.0 (96.2)    
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES   166.2   (47.6) 123.2 (119.0)    
INCOME TAX PROVISION         0.0      
DISCONTINUED OPERATIONS, NET         0.0      
EQUITY EARNINGS IN AFFILIATES, NET OF TAX   424.4   307.9 642.7 704.0    
NET INCOME   590.6   260.3 765.9 585.0    
NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS         0.0      
NET INCOME ATTRIBUTABLE TO ENSCO   590.6   260.3 765.9 585.0    
ENSCO International Inc. [Member]                
Guarantor Obligations [Line Items]                
OPERATING REVENUES   36.5   34.5 72.1 69.3    
Contract drilling (exclusive of depreciation)   36.4   34.5 72.1 69.3    
Depreciation   4.4   2.4 8.7 4.9    
General and administrative   0.0   0.0 0.1 0.1    
OPERATING (LOSS) INCOME   (4.3)   (2.4) (8.8) (5.0)    
OTHER INCOME (EXPENSE), NET   (8.3)   2.4 (6.7) (14.4)    
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES   (12.6)   0.0 (15.5) (19.4)    
INCOME TAX PROVISION   (15.6)   14.1 15.4 27.9    
DISCONTINUED OPERATIONS, NET         0.0      
EQUITY EARNINGS IN AFFILIATES, NET OF TAX   20.0   47.5 53.5 92.7    
NET INCOME   23.0   33.4 22.6 45.4    
NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS         0.0      
NET INCOME ATTRIBUTABLE TO ENSCO   23.0   33.4 22.6 45.4    
Pride International, Inc. [Member]                
Guarantor Obligations [Line Items]                
OPERATING REVENUES   0.0     0.0      
Contract drilling (exclusive of depreciation)         0.0      
Depreciation         0.0      
General and administrative         0.0      
OTHER INCOME (EXPENSE), NET   (18.8)   (15.2) (37.9) (31.1)    
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES   (18.8)   (15.2) (37.9) (31.1)    
INCOME TAX PROVISION   0.0     0.0      
DISCONTINUED OPERATIONS, NET         0.0      
EQUITY EARNINGS IN AFFILIATES, NET OF TAX   10.2   71.4 63.8 135.3    
NET INCOME   (8.6)   56.2 25.9 104.2    
NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS         0.0      
NET INCOME ATTRIBUTABLE TO ENSCO   (8.6)   56.2 25.9 104.2    
Other Non-Guarantor Subsidiaries Of Ensco [Member]                
Guarantor Obligations [Line Items]                
OPERATING REVENUES   937.4   1,086.6 1,780.7 2,278.2    
Contract drilling (exclusive of depreciation)   379.0   532.6 771.9 1,080.5    
Depreciation   108.0   138.1 217.0 272.6    
General and administrative   16.9   16.0 34.0 32.7    
OPERATING (LOSS) INCOME   433.5   399.9 757.8 892.4    
OTHER INCOME (EXPENSE), NET   1.3   (6.3) (9.0) 13.7    
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES   434.8   393.6 748.8 906.1    
INCOME TAX PROVISION   52.3   43.9 92.7 107.8    
DISCONTINUED OPERATIONS, NET   (0.2)   (10.1) (1.1) (10.3)    
NET INCOME   382.3   339.6 655.0 788.0    
NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS   (2.0)   (2.4) (3.4) (5.6)    
NET INCOME ATTRIBUTABLE TO ENSCO   380.3   337.2 651.6 782.4    
Consolidating Adjustments [Member]                
Guarantor Obligations [Line Items]                
OPERATING REVENUES   (71.9)   (70.8) (144.0) (142.0)    
Contract drilling (exclusive of depreciation)   (71.9)   (70.8) (144.0) (142.0)    
Depreciation         0.0      
General and administrative         0.0      
OPERATING (LOSS) INCOME         0.0      
OTHER INCOME (EXPENSE), NET   59.9     59.9      
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES   59.9     59.9      
INCOME TAX PROVISION         0.0      
DISCONTINUED OPERATIONS, NET         0.0      
EQUITY EARNINGS IN AFFILIATES, NET OF TAX   (454.6)   (426.8) (760.0) (932.0)    
NET INCOME   (394.7)   (426.8) (700.1) (932.0)    
NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS         0.0      
NET INCOME ATTRIBUTABLE TO ENSCO   $ (394.7)   $ (426.8) $ (700.1) $ (932.0)