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Consolidated Statements Of Operations - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Statement [Abstract]
OPERATING REVENUES	$ 1,705.4	$ 1,843.0	$ 2,776.4
OPERATING EXPENSES
Contract drilling (exclusive of depreciation)	1,319.4	1,189.5	1,301.0
Loss on impairment	40.3	182.9	0.0
Depreciation	478.9	444.8	445.3
General and administrative	102.7	157.8	100.8
Total operating expenses	1,941.3	1,975.0	1,847.1
OPERATING INCOME (LOSS)	(235.9)	(132.0)	929.3
OTHER INCOME (EXPENSE)
Interest income	14.5	25.8	13.8
Interest expense, net	(282.7)	(224.2)	(228.8)
Other, net	(34.8)	134.4	283.2
Other income (expense), net	(303.0)	(64.0)	68.2
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	(538.9)	(196.0)	997.5
PROVISION FOR INCOME TAXES
Current income tax expense	33.0	54.2	79.8
Deferred income tax expense (benefit)	56.6	55.0	28.7
Total provision for income taxes	89.6	109.2	108.5
INCOME (LOSS) FROM CONTINUING OPERATIONS	(628.5)	(305.2)	889.0
INCOME (LOSS) FROM DISCONTINUED OPERATIONS, NET	(8.1)	1.0	8.1
NET INCOME (LOSS)	(636.6)	(304.2)	897.1
NET (INCOME) LOSS ATTRIBUTABLE TO NONCONTROLLING INTERESTS	(3.1)	0.5	(6.9)
NET INCOME (LOSS) ATTRIBUTABLE TO ENSCO	$ (639.7)	$ (303.7)	$ 890.2
EARNINGS (LOSS) PER SHARE - BASIC AND DILUTED
Continuing operations	$ (1.45)	$ (0.91)	$ 3.10
Discontinued operations	(0.02)	0.00	0.03
Total earnings per share - basic	$ (1.47)	$ (0.91)	$ 3.13
WEIGHTED-AVERAGE SHARES OUTSTANDING
Basic and Diluted	434.1	332.5	279.1

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