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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, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Quarterly Financial Data [Abstract]
OPERATING REVENUES	$ 504.6	$ 548.2	$ 909.6	$ 814.0	$ 828.3	$ 1,012.2	$ 1,059.0	$ 1,163.9	$ 2,776.4	$ 4,063.4	$ 4,564.5
Contract drilling (exclusive of depreciation)	289.0	298.1	350.2	363.7	415.2	433.5	502.6	518.3	1,301.0	1,869.6	2,076.9
Loss on impairment					2,744.0	2.4	0.0	0.0	0.0	2,746.4	4,218.7
Depreciation	110.2	109.4	112.4	113.3	149.7	145.2	140.5	137.1	445.3	572.5	537.9
General and administrative	24.7	25.3	27.4	23.4	30.2	28.4	29.7	30.1	100.8	118.4	131.9
OPERATING INCOME	80.7	115.4	419.6	313.6	(2,510.8)	402.7	386.2	478.4	929.3	(1,243.5)	(2,400.9)
Other (expense) income, net	(46.2)	(30.9)	209.9	(64.6)	(47.3)	(52.4)	(55.4)	(72.6)	68.2	(227.7)	(147.9)
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	34.5	84.5	629.5	249.0	(2,558.1)	350.3	330.8	405.8	997.5	(1,471.2)	(2,548.8)
Provision for income taxes	3.9	(3.5)	36.7	71.4	(182.8)	33.2	58.0	77.7	108.5	(13.9)	140.5
INCOME (LOSS) FROM CONTINUING OPERATIONS	30.6	88.0	592.8	177.6	(2,375.3)	317.1	272.8	328.1	889.0	(1,457.3)	(2,689.3)
INCOME (LOSS) FROM DISCONTINUED OPERATIONS, NET	9.9	(0.7)	(0.2)	(0.9)	(95.0)	(23.3)	(10.1)	(0.2)	8.1	(128.6)	(1,199.2)
NET INCOME (LOSS)	40.5	87.3	592.6	176.7	(2,470.3)	293.8	262.7	327.9	897.1	(1,585.9)	(3,888.5)
NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	(1.5)	(2.0)	(2.0)	(1.4)	(1.5)	(1.8)	(2.4)	(3.2)	(6.9)	(8.9)	(14.1)
NET INCOME (LOSS) ATTRIBUTABLE TO ENSCO	$ 39.0	$ 85.3	$ 590.6	$ 175.3	$ (2,471.8)	$ 292.0	$ 260.3	$ 324.7	$ 890.2	$ (1,594.8)	$ (3,902.6)
Earnings per share – basic and diluted
Continuing operations	$ 0.10	$ 0.28	$ 2.04	$ 0.74	$ (10.23)	$ 1.34	$ 1.15	$ 1.38	$ 3.10	$ (6.33)	$ (11.70)
Discontinued operations	0.03	0.00	0.00	0.00	(0.41)	(0.10)	(0.04)	0.00	0.03	(0.55)	(5.18)
Total earnings per share - basic	$ 0.13	$ 0.28	$ 2.04	$ 0.74	$ (10.64)	$ 1.24	$ 1.11	$ 1.38	$ 3.13	$ (6.88)	$ (16.88)

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