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Guarantee Of Registered Securities (Condensed Consolidating Statements Of Income) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Guarantor Obligations [Line Items]
Revenues	$ 430.9	$ 460.2	$ 1,306.4	$ 1,388.8
Contract drilling (exclusive of depreciation)	327.1	285.8	996.6	855.2
Depreciation expense	120.6	108.2	356.5	325.3
General and administrative	25.1	30.4	79.1	86.9
OPERATING INCOME (LOSS)	(41.9)	35.8	(125.8)	121.4
OTHER INCOME (EXPENSE), NET	(77.7)	(40.4)	(233.2)	(151.3)
LOSS FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	(119.6)	(4.6)	(359.0)	(29.9)
INCOME TAX PROVISION	23.3	23.4	66.4	66.8
DISCONTINUED OPERATIONS, NET	0.0	(0.2)	(8.1)	(0.4)
EQUITY EARNINGS IN AFFILIATES, NET OF TAX	0.0	0.0	0.0	0.0
NET LOSS	(142.9)	(28.2)	(433.5)	(97.1)
NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	(2.1)	2.8	(2.6)	0.5
NET LOSS ATTRIBUTABLE TO ENSCO	(145.0)	(25.4)	(436.1)	(96.6)
Ensco plc
Guarantor Obligations [Line Items]
Revenues	12.1	13.0	36.7	38.5
Contract drilling (exclusive of depreciation)	15.2	11.3	41.6	33.7
Depreciation expense	0.0	0.0	0.0	0.0
General and administrative	10.5	10.3	31.0	33.9
OPERATING INCOME (LOSS)	(13.6)	(8.6)	(35.9)	(29.1)
OTHER INCOME (EXPENSE), NET	(0.6)	3.4	(0.1)	(10.2)
LOSS FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	(14.2)	(5.2)	(36.0)	(39.3)
INCOME TAX PROVISION	0.0	0.0	0.0	0.0
DISCONTINUED OPERATIONS, NET	0.0	0.0	0.0	0.0
EQUITY EARNINGS IN AFFILIATES, NET OF TAX	(130.8)	(20.2)	(400.1)	(57.3)
NET LOSS	(145.0)	(25.4)	(436.1)	(96.6)
NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	0.0	0.0	0.0	0.0
NET LOSS ATTRIBUTABLE TO ENSCO	(145.0)	(25.4)	(436.1)	(96.6)
ENSCO International Incorporated
Guarantor Obligations [Line Items]
Revenues	40.7	47.2	120.8	137.1
Contract drilling (exclusive of depreciation)	36.4	43.0	109.2	126.4
Depreciation expense	3.6	4.0	10.6	12.5
General and administrative	1.9	5.1	2.2	9.4
OPERATING INCOME (LOSS)	(1.2)	(4.9)	(1.2)	(11.2)
OTHER INCOME (EXPENSE), NET	(32.6)	(28.0)	(101.1)	(86.2)
LOSS FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	(33.8)	(32.9)	(102.3)	(97.4)
INCOME TAX PROVISION	9.5	11.6	32.4	30.5
DISCONTINUED OPERATIONS, NET	0.0	0.0	0.0	0.0
EQUITY EARNINGS IN AFFILIATES, NET OF TAX	28.2	29.9	77.7	113.5
NET LOSS	(15.1)	(14.6)	(57.0)	(14.4)
NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	0.0	0.0	0.0	0.0
NET LOSS ATTRIBUTABLE TO ENSCO	(15.1)	(14.6)	(57.0)	(14.4)
Pride International LLC
Guarantor Obligations [Line Items]
Revenues	0.0	0.0	0.0	0.0
Contract drilling (exclusive of depreciation)	0.0	0.0	0.0	0.0
Depreciation expense	0.0	0.0	0.0	0.0
General and administrative	0.0	0.0	0.0	0.0
OPERATING INCOME (LOSS)	0.0	0.0	0.0	0.0
OTHER INCOME (EXPENSE), NET	(19.5)	(17.4)	(69.5)	(53.0)
LOSS FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	(19.5)	(17.4)	(69.5)	(53.0)
INCOME TAX PROVISION	0.0	0.0	0.0	0.0
DISCONTINUED OPERATIONS, NET	0.0	0.0	0.0	0.0
EQUITY EARNINGS IN AFFILIATES, NET OF TAX	23.1	23.2	69.1	69.4
NET LOSS	3.6	5.8	(0.4)	16.4
NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	0.0	0.0	0.0	0.0
NET LOSS ATTRIBUTABLE TO ENSCO	3.6	5.8	(0.4)	16.4
Other Non-Guarantor Subsidiaries of Ensco
Guarantor Obligations [Line Items]
Revenues	459.2	490.1	1,387.0	1,477.3
Contract drilling (exclusive of depreciation)	356.6	321.6	1,083.9	959.2
Depreciation expense	117.0	104.2	345.9	312.8
General and administrative	12.7	15.0	45.9	43.6
OPERATING INCOME (LOSS)	(27.1)	49.3	(88.7)	161.7
OTHER INCOME (EXPENSE), NET	(29.0)	(1.0)	(85.9)	(13.6)
LOSS FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	(56.1)	48.3	(174.6)	148.1
INCOME TAX PROVISION	13.8	11.8	34.0	36.3
DISCONTINUED OPERATIONS, NET	0.0	(0.2)	(8.1)	(0.4)
EQUITY EARNINGS IN AFFILIATES, NET OF TAX	0.0	0.0	0.0	0.0
NET LOSS	(69.9)	36.3	(216.7)	111.4
NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	(2.1)	2.8	(2.6)	0.5
NET LOSS ATTRIBUTABLE TO ENSCO	(72.0)	39.1	(219.3)	111.9
Consolidating Adjustments
Guarantor Obligations [Line Items]
Revenues	(81.1)	(90.1)	(238.1)	(264.1)
Contract drilling (exclusive of depreciation)	(81.1)	(90.1)	(238.1)	(264.1)
Depreciation expense	0.0	0.0	0.0	0.0
General and administrative	0.0	0.0	0.0	0.0
OPERATING INCOME (LOSS)	0.0	0.0	0.0	0.0
OTHER INCOME (EXPENSE), NET	4.0	2.6	23.4	11.7
LOSS FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	4.0	2.6	23.4	11.7
INCOME TAX PROVISION	0.0	0.0	0.0	0.0
DISCONTINUED OPERATIONS, NET	0.0	0.0	0.0	0.0
EQUITY EARNINGS IN AFFILIATES, NET OF TAX	79.5	(32.9)	253.3	(125.6)
NET LOSS	83.5	(30.3)	276.7	(113.9)
NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	0.0	0.0	0.0	0.0
NET LOSS ATTRIBUTABLE TO ENSCO	$ 83.5	$ (30.3)	$ 276.7	$ (113.9)

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