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Consolidated Statements Of Income - USD ($)
shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Statement [Abstract]      
OPERATING REVENUES $ 4,063.4 $ 4,564.5 $ 4,323.4
OPERATING EXPENSES      
Contract drilling (exclusive of depreciation) 1,869.6 2,076.9 1,947.1
Asset Impairment Charges 2,746.4 4,218.7 0.0
Depreciation 572.5 537.9 496.2
General and administrative 118.4 131.9 146.8
Total operating expenses 5,306.9 6,965.4 2,590.1
OPERATING INCOME (1,243.5) (2,400.9) 1,733.3
OTHER INCOME (EXPENSE)      
Interest income 9.9 13.0 16.6
Interest expense, net (216.3) (161.4) (158.8)
Other, net (21.3) 0.5 42.1
Other income (expense), net (227.7) (147.9) (100.1)
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES (1,471.2) (2,548.8) 1,633.2
PROVISION FOR INCOME TAXES      
Current income tax expense 144.1 264.0 193.0
Deferred income tax expense (benefit) (158.0) (123.5) 10.1
Total provision for income taxes (13.9) 140.5 203.1
INCOME FROM CONTINUING OPERATIONS (1,457.3) (2,689.3) 1,430.1
DISCONTINUED OPERATIONS, NET (128.6) (1,199.2) (2.2)
NET INCOME (1,585.9) (3,888.5) 1,427.9
NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS (8.9) (14.1) (9.7)
NET INCOME ATTRIBUTABLE TO ENSCO $ (1,594.8) $ (3,902.6) $ 1,418.2
EARNINGS PER SHARE - BASIC      
Continuing operations $ (6.33) $ (11.70) $ 6.09
Discontinued operations (0.55) (5.18) (0.01)
Total earnings per share - basic (6.88) (16.88) 6.08
EARNINGS PER SHARE - DILUTED      
Continuing operations (6.33) (11.70) 6.08
Discontinued operations (0.55) (5.18) (0.01)
Total earnings per share - diluted $ (6.88) $ (16.88) $ 6.07
NET INCOME ATTRIBUTABLE TO ENSCO SHARES - BASIC AND DILUTED $ (1,596.8) $ (3,910.5) $ 1,403.1
WEIGHTED-AVERAGE SHARES OUTSTANDING      
Basic 232.2 231.6 230.9
Diluted 232.2 231.6 231.1
CASH DIVIDENDS PER SHARE $ 0.6 $ 3.0 $ 2.25