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Consolidated Statements Of Operations - USD ($)
shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Statement [Abstract]      
OPERATING REVENUES $ 1,843.0 $ 2,776.4 $ 4,063.4
OPERATING EXPENSES      
Contract drilling (exclusive of depreciation) 1,189.5 1,301.0 1,869.6
Loss on impairment 182.9 0.0 2,746.4
Depreciation 444.8 445.3 572.5
General and administrative 157.8 100.8 118.4
Total operating expenses 1,975.0 1,847.1 5,306.9
OPERATING INCOME (LOSS) (132.0) 929.3 (1,243.5)
OTHER INCOME (EXPENSE)      
Interest income 25.8 13.8 9.9
Interest expense, net (224.2) (228.8) (216.3)
Other, net 134.4 283.2 (21.3)
Other income (expense), net (64.0) 68.2 (227.7)
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES (196.0) 997.5 (1,471.2)
PROVISION FOR INCOME TAXES      
Current income tax expense 54.2 79.8 144.1
Deferred income tax expense (benefit) 55.0 28.7 (158.0)
Total provision for income taxes 109.2 108.5 (13.9)
INCOME (LOSS) FROM CONTINUING OPERATIONS (305.2) 889.0 (1,457.3)
INCOME (LOSS) FROM DISCONTINUED OPERATIONS, NET 1.0 8.1 (128.6)
NET INCOME (LOSS) (304.2) 897.1 (1,585.9)
NET (INCOME) LOSS ATTRIBUTABLE TO NONCONTROLLING INTERESTS 0.5 (6.9) (8.9)
NET INCOME (LOSS) ATTRIBUTABLE TO ENSCO $ (303.7) $ 890.2 $ (1,594.8)
EARNINGS (LOSS) PER SHARE - BASIC AND DILUTED      
Continuing operations $ (0.91) $ 3.10 $ (6.33)
Discontinued operations 0.00 0.03 (0.55)
Total earnings per share - basic $ (0.91) $ 3.13 $ (6.88)
NET INCOME ATTRIBUTABLE TO ENSCO SHARES - BASIC AND DILUTED $ (304.1) $ 873.6 $ (1,596.8)
WEIGHTED-AVERAGE SHARES OUTSTANDING      
Basic and Diluted 332.5 279.1 232.2
CASH DIVIDENDS PER SHARE $ 0.04 $ 0.04 $ 0.60