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Unaudited Quarterly Financial Data (Summary Of Unaudited Quarterly Consolidated Income Statement) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended									9 Months Ended	12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Mar. 31, 2016	Sep. 30, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Quarterly Financial Data [Abstract]
Revenues	$ 399.0	$ 430.9	$ 458.5	$ 417.0	$ 454.2	$ 460.2	$ 457.5	$ 471.1			$ 1,705.4	$ 1,843.0	$ 2,776.4
Contract drilling (exclusive of depreciation)	322.8	327.1	344.3	325.2	334.3	285.8	291.3	278.1			1,319.4	1,189.5	1,301.0
Loss on impairment	40.3	0.0	0.0	0.0	182.9	0.0	0.0	0.0			40.3	182.9	0.0
Depreciation expense	122.4	120.6	120.7	115.2	119.5	108.2	107.9	109.2			478.9	444.8	445.3
General and administrative	23.6	25.1	26.1	27.9	70.9	30.4	30.5	26.0			102.7	157.8	100.8
OPERATING INCOME (LOSS)	(110.1)	(41.9)	(32.6)	(51.3)	(253.4)	35.8	27.8	57.8			(235.9)	(132.0)	929.3
Other expense, net	(69.8)	(77.7)	(84.8)	(70.7)	87.3	(40.4)	(53.2)	(57.7)			(303.0)	(64.0)	68.2
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	(179.9)	(119.6)	(117.4)	(122.0)	(166.1)	(4.6)	(25.4)	0.1			(538.9)	(196.0)	997.5
Provision for income taxes	23.2	23.3	24.7	18.4	42.4	23.4	19.3	24.1			89.6	109.2	108.5
INCOME (LOSS) FROM CONTINUING OPERATIONS	(203.1)	(142.9)	(142.1)	(140.4)	(208.5)	(28.0)	(44.7)	(24.0)			(628.5)	(305.2)	889.0
INCOME (LOSS) FROM DISCONTINUED OPERATIONS, NET	0.0	0.0	(8.0)	(0.1)	1.4	(0.2)	0.4	(0.6)	$ 8.1		(8.1)	1.0	8.1
NET INCOME (LOSS)	(203.1)	(142.9)	(150.1)	(140.5)	(207.1)	(28.2)	(44.3)	(24.6)			(636.6)	(304.2)	897.1
NET (INCOME) LOSS ATTRIBUTABLE TO NONCONTROLLING INTERESTS	(0.5)	(2.1)	(0.9)	0.4	0.0	2.8	(1.2)	(1.1)			(3.1)	0.5	(6.9)
NET INCOME (LOSS) ATTRIBUTABLE TO ENSCO	$ (203.6)	$ (145.0)	$ (151.0)	$ (140.1)	$ (207.1)	$ (25.4)	$ (45.5)	$ (25.7)			$ (639.7)	$ (303.7)	$ 890.2
Loss per share – basic and diluted
Continuing operations	$ (0.47)	$ (0.33)	$ (0.33)	$ (0.32)	$ (0.49)	$ (0.08)	$ (0.15)	$ (0.09)			$ (1.45)	$ (0.91)	$ 3.10
Discontinued operations	0.00	0.00	(0.02)	0.00	0.00	0.00	0.00	0.00			(0.02)	0.00	0.03
Total earnings per share - basic	$ (0.47)	$ (0.33)	$ (0.35)	$ (0.32)	$ (0.49)	$ (0.08)	$ (0.15)	$ (0.09)			$ (1.47)	$ (0.91)	$ 3.13
Business Combination, Integration Related Costs, Contract Dilling Expense	$ 7.0
Business Combination, Integration Related Costs, G&A	30.9
Merger related costs	$ 11.5
Bargain purchase gain										$ 142.0	$ 1.8	$ 140.2	$ 0.0
Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Provisional Income Tax Expense (Benefit)												16.5
Gain (Loss) on Extinguishment of Debt								$ 6.2			$ (19.0)	$ (2.6)	$ 287.8
Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Change in Tax Rate, Provisional Income Tax Expense (Benefit)					$ 16.5

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