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Guarantee Of Registered Securities (Condensed Consolidating Statements Of Income) (Details) - USD ($) $ in Millions	3 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	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Guarantor Obligations [Line Items]
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) INCOME, 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
Total 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
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
EQUITY EARNINGS IN AFFILIATES, NET OF TAX										0.0	0.0	0.0
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
Ensco Plc [Member]
Guarantor Obligations [Line Items]
Revenues										49.5	52.9	27.9
Contract drilling (exclusive of depreciation)										51.0	50.0	27.3
Loss on impairment										0.0	0.0
Depreciation expense										0.0	0.0	0.0
General and administrative										46.3	45.4	36.2
OPERATING INCOME (LOSS)										(47.8)	(42.5)	(35.6)
OTHER (EXPENSE) INCOME, NET										2.7	(6.8)	152.9
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES										(45.1)	(49.3)	117.3
Total provision for income taxes										0.0	0.0	0.0
DISCONTINUED OPERATIONS, NET										0.0	0.0	0.0
EQUITY EARNINGS IN AFFILIATES, NET OF TAX										(594.6)	(254.4)	772.9
NET INCOME (LOSS)										(639.7)	(303.7)	890.2
NET (INCOME) LOSS ATTRIBUTABLE TO NONCONTROLLING INTERESTS										0.0	0.0	0.0
NET INCOME (LOSS) ATTRIBUTABLE TO ENSCO										(639.7)	(303.7)	890.2
ENSCO International Inc. [Member]
Guarantor Obligations [Line Items]
Revenues										155.2	163.3	144.4
Contract drilling (exclusive of depreciation)										139.5	149.9	144.8
Loss on impairment										0.0	0.0
Depreciation expense										14.2	15.9	17.2
General and administrative										0.4	50.8	0.2
OPERATING INCOME (LOSS)										1.1	(53.3)	(17.8)
OTHER (EXPENSE) INCOME, NET										(135.2)	(110.5)	(79.0)
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES										(134.1)	(163.8)	(96.8)
Total provision for income taxes										43.3	45.0	0.7
DISCONTINUED OPERATIONS, NET										0.0	0.0	0.0
EQUITY EARNINGS IN AFFILIATES, NET OF TAX										121.8	129.6	205.7
NET INCOME (LOSS)										(55.6)	(79.2)	108.2
NET (INCOME) LOSS ATTRIBUTABLE TO NONCONTROLLING INTERESTS										0.0	0.0	0.0
NET INCOME (LOSS) ATTRIBUTABLE TO ENSCO										(55.6)	(79.2)	108.2
Pride International Inc. [Member]
Guarantor Obligations [Line Items]
Revenues										0.0	0.0	0.0
Contract drilling (exclusive of depreciation)										0.0	0.0	0.1
Loss on impairment										0.0	0.0
Depreciation expense										0.0	0.0	0.4
General and administrative										0.0	0.0	0.0
OPERATING INCOME (LOSS)										0.0	0.0	(0.5)
OTHER (EXPENSE) INCOME, NET										(89.0)	(71.7)	(76.6)
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES										(89.0)	(71.7)	(77.1)
Total provision for income taxes										0.0	0.0	(0.6)
DISCONTINUED OPERATIONS, NET										0.0	0.0	0.0
EQUITY EARNINGS IN AFFILIATES, NET OF TAX										93.3	84.2	125.7
NET INCOME (LOSS)										4.3	12.5	49.2
NET (INCOME) LOSS ATTRIBUTABLE TO NONCONTROLLING INTERESTS										0.0	0.0	0.0
NET INCOME (LOSS) ATTRIBUTABLE TO ENSCO										4.3	12.5	49.2
Other Non-Guarantor Subsidiaries Of Ensco [Member]
Guarantor Obligations [Line Items]
Revenues										1,802.8	1,941.2	2,897.4
Contract drilling (exclusive of depreciation)										1,431.0	1,304.0	1,422.1
Loss on impairment										40.3	182.9
Depreciation expense										464.7	428.9	427.7
General and administrative										56.0	61.6	64.4
OPERATING INCOME (LOSS)										(189.2)	(36.2)	983.2
OTHER (EXPENSE) INCOME, NET										(109.0)	110.5	7.8
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES										(298.2)	74.3	991.0
Total provision for income taxes										46.3	64.2	108.4
DISCONTINUED OPERATIONS, NET										(8.1)	1.0	8.1
EQUITY EARNINGS IN AFFILIATES, NET OF TAX										0.0	0.0	0.0
NET INCOME (LOSS)										(352.6)	11.1	890.7
NET (INCOME) LOSS ATTRIBUTABLE TO NONCONTROLLING INTERESTS										(3.1)	0.5	(6.9)
NET INCOME (LOSS) ATTRIBUTABLE TO ENSCO										(355.7)	11.6	883.8
Consolidating Adjustments [Member]
Guarantor Obligations [Line Items]
Revenues										(302.1)	(314.4)	(293.3)
Contract drilling (exclusive of depreciation)										(302.1)	(314.4)	(293.3)
Loss on impairment										0.0	0.0
Depreciation expense										0.0	0.0	0.0
General and administrative										0.0	0.0	0.0
OPERATING INCOME (LOSS)										0.0	0.0	0.0
OTHER (EXPENSE) INCOME, NET										27.5	14.5	63.1
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES										27.5	14.5	63.1
Total provision for income taxes										0.0	0.0	0.0
DISCONTINUED OPERATIONS, NET										0.0	0.0	0.0
EQUITY EARNINGS IN AFFILIATES, NET OF TAX										379.5	40.6	(1,104.3)
NET INCOME (LOSS)										407.0	55.1	(1,041.2)
NET (INCOME) LOSS ATTRIBUTABLE TO NONCONTROLLING INTERESTS										0.0	0.0	0.0
NET INCOME (LOSS) ATTRIBUTABLE TO ENSCO										$ 407.0	$ 55.1	$ (1,041.2)

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