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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								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Quarterly Financial Data [Abstract]
Revenues	$ 454.2	$ 460.2	$ 457.5	$ 471.1	$ 504.6	$ 548.2	$ 909.6	$ 814.0	$ 1,843.0	$ 2,776.4	$ 4,063.4
Contract drilling (exclusive of depreciation)	334.3	285.8	291.3	278.1	289.0	298.1	350.2	363.7	1,189.5	1,301.0	1,869.6
Loss on impairment	182.9	0.0	0.0	0.0					182.9	0.0	2,746.4
Depreciation	119.5	108.2	107.9	109.2	110.2	109.4	112.4	113.3	444.8	445.3	572.5
General and administrative	70.9	30.4	30.5	26.0	24.7	25.3	27.4	23.4	157.8	100.8	118.4
OPERATING INCOME (LOSS)	(253.4)	35.8	27.8	57.8	80.7	115.4	419.6	313.6	(132.0)	929.3	(1,243.5)
Other income (expense), net(4)	87.3	(40.4)	(53.2)	(57.7)	(46.2)	(30.9)	209.9	(64.6)	(64.0)	68.2	(227.7)
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	(166.1)	(4.6)	(25.4)	0.1	34.5	84.5	629.5	249.0	(196.0)	997.5	(1,471.2)
Provision for income taxes	42.4	23.4	19.3	24.1	3.9	(3.5)	36.7	71.4	109.2	108.5	(13.9)
INCOME (LOSS) FROM CONTINUING OPERATIONS	(208.5)	(28.0)	(44.7)	(24.0)	30.6	88.0	592.8	177.6	(305.2)	889.0	(1,457.3)
INCOME (LOSS) FROM DISCONTINUED OPERATIONS, NET	1.4	(0.2)	0.4	(0.6)	9.9	(0.7)	(0.2)	(0.9)	1.0	8.1	(128.6)
NET (INCOME) LOSS ATTRIBUTABLE TO NONCONTROLLING INTERESTS	0.0	2.8	(1.2)	(1.1)	(1.5)	(2.0)	(2.0)	(1.4)	0.5	(6.9)	(8.9)
NET INCOME (LOSS)	(207.1)	(28.2)	(44.3)	(24.6)	40.5	87.3	592.6	176.7	(304.2)	897.1	(1,585.9)
NET INCOME (LOSS) ATTRIBUTABLE TO ENSCO	$ (207.1)	$ (25.4)	$ (45.5)	$ (25.7)	$ 39.0	$ 85.3	$ 590.6	$ 175.3	$ (303.7)	$ 890.2	$ (1,594.8)
Loss per share – basic and diluted
Continuing operations	$ (0.49)	$ (0.08)	$ (0.15)	$ (0.09)	$ 0.10	$ 0.28	$ 2.04	$ 0.74	$ (0.91)	$ 3.10	$ (6.33)
Discontinued operations	0.00	0.00	0.00	0.00	0.03	0.00	0.00	0.00	0.00	0.03	(0.55)
Total earnings per share - basic	$ (0.49)	$ (0.08)	$ (0.15)	$ (0.09)	$ 0.13	$ 0.28	$ 2.04	$ 0.74	$ (0.91)	$ 3.13	$ (6.88)
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	140.2								$ 140.2	$ 0.0	$ 0.0
Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Provisional Income Tax Expense (Benefit)	$ 16.5
Gain (Loss) on Contract Termination							$ 205.0
Gain (Loss) on Extinguishment of Debt				$ 6.2					$ (2.6)	$ 287.8	$ (33.5)

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