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Condensed Consolidated Statements Of Income - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Income Statement [Abstract]
OPERATING REVENUES	$ 1,059.0	$ 1,136.6	$ 2,222.9	$ 2,203.3
OPERATING EXPENSES
Contract drilling (exclusive of depreciation)	502.6	542.5	1,020.9	1,062.7
Asset Impairment Charges	0.0	703.5	0.0	703.5
Depreciation	140.5	132.2	277.6	263.3
General and administrative	29.7	36.2	59.8	74.3
Total operating expenses	672.8	1,414.4	1,358.3	2,103.8
OPERATING (LOSS) INCOME	386.2	(277.8)	864.6	99.5
OTHER INCOME (EXPENSE)
Interest income	3.4	3.5	5.8	7.1
Interest expense, net	(51.2)	(36.4)	(103.6)	(71.0)
Other, net	(7.6)	2.1	(30.2)	4.0
Other income (expense), net	(55.4)	(30.8)	(128.0)	(59.9)
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	330.8	(308.6)	736.6	39.6
PROVISION FOR INCOME TAXES
Current income tax expense	43.9	47.2	106.6	102.4
Deferred income tax (benefit) expense	14.1	(4.6)	29.1	(10.3)
Total provision for income taxes	58.0	42.6	135.7	92.1
INCOME FROM CONTINUING OPERATIONS	272.8	(351.2)	600.9	(52.5)
DISCONTINUED OPERATIONS
Discontinued operations, net	10.1	818.4	10.3	820.4
NET INCOME	262.7	(1,169.6)	590.6	(872.9)
NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	(2.4)	(3.1)	(5.6)	(7.3)
NET INCOME ATTRIBUTABLE TO ENSCO	$ 260.3	$ (1,172.7)	$ 585.0	$ (880.2)
EARNINGS PER SHARE - BASIC AND DILUTED
Income (Loss) from Continuing Operations, Per Basic and Diluted Share	$ 1.15	$ (1.53)	$ 2.53	$ (0.27)
Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Basic and Diluted Share	(0.04)	(3.54)	(0.04)	(3.55)
Earnings Per Share, Basic and Diluted	$ 1.11	$ (5.07)	$ 2.49	$ (3.82)
NET INCOME ATTRIBUTABLE TO ENSCO SHARES - BASIC AND DILUTED	$ 256.7	$ (1,174.8)	$ 577.7	$ (884.1)
WEIGHTED-AVERAGE SHARES OUTSTANDING
Basic (in shares)	232.1	231.5	232.0	231.4
Diluted (in shares)	232.2	231.5	232.1	231.4
CASH DIVIDENDS PER SHARE (in dollars per share)	$ 0.150	$ 0.750	$ 0.300	$ 1.500

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