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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, 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
Guarantor Obligations [Line Items]
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)
Total 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
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)
EQUITY EARNINGS IN AFFILIATES, NET OF TAX									0.0	0.0	0.0
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)
Ensco Plc [Member]
Guarantor Obligations [Line Items]
OPERATING REVENUES									27.9	31.7	34.5
Contract drilling (exclusive of depreciation)									27.3	29.2	31.8
Loss on impairment										0.0	0.0
Depreciation									0.0	0.1	0.2
General and administrative									36.2	51.5	52.0
OPERATING INCOME									(35.6)	(49.1)	(49.5)
OTHER (EXPENSE) INCOME, NET									152.9	(169.5)	(67.0)
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES									117.3	(218.6)	(116.5)
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									772.9	(1,376.2)	(3,786.1)
NET INCOME (LOSS)									890.2	(1,594.8)	(3,902.6)
NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS									0.0	0.0	0.0
NET INCOME (LOSS) ATTRIBUTABLE TO ENSCO									890.2	(1,594.8)	(3,902.6)
ENSCO International Inc. [Member]
Guarantor Obligations [Line Items]
OPERATING REVENUES									144.4	163.5	145.4
Contract drilling (exclusive of depreciation)									144.8	163.5	145.4
Loss on impairment										0.0	0.0
Depreciation									17.2	13.8	7.6
General and administrative									0.2	0.2	0.4
OPERATING INCOME									(17.8)	(14.0)	(8.0)
OTHER (EXPENSE) INCOME, NET									(79.0)	(28.6)	(43.3)
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES									(96.8)	(42.6)	(51.3)
Total provision for income taxes									0.7	(190.6)	(44.9)
DISCONTINUED OPERATIONS, NET									0.0	0.0	0.0
EQUITY EARNINGS IN AFFILIATES, NET OF TAX									205.7	(1,672.8)	(3,651.0)
NET INCOME (LOSS)									108.2	(1,524.8)	(3,657.4)
NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS									0.0	0.0	0.0
NET INCOME (LOSS) ATTRIBUTABLE TO ENSCO									108.2	(1,524.8)	(3,657.4)
Pride International Inc. [Member]
Guarantor Obligations [Line Items]
OPERATING REVENUES									0.0	0.0	0.0
Contract drilling (exclusive of depreciation)									0.1	0.0	0.0
Loss on impairment										0.0	0.0
Depreciation									0.4	0.0	0.0
General and administrative									0.0	0.0	0.0
OPERATING INCOME									(0.5)	0.0	0.0
OTHER (EXPENSE) INCOME, NET									(76.6)	(71.5)	(54.7)
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES									(77.1)	(71.5)	(54.7)
Total provision for income taxes									(0.6)	0.0	0.0
DISCONTINUED OPERATIONS, NET									0.0	0.0	0.0
EQUITY EARNINGS IN AFFILIATES, NET OF TAX									125.7	(1,771.5)	(3,744.3)
NET INCOME (LOSS)									49.2	(1,843.0)	(3,799.0)
NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS									0.0	0.0	0.0
NET INCOME (LOSS) ATTRIBUTABLE TO ENSCO									49.2	(1,843.0)	(3,799.0)
Other Non-Guarantor Subsidiaries Of Ensco [Member]
Guarantor Obligations [Line Items]
OPERATING REVENUES									2,897.4	4,199.4	4,683.0
Contract drilling (exclusive of depreciation)									1,422.1	2,008.1	2,198.1
Loss on impairment										2,746.4	4,218.7
Depreciation									427.7	558.6	530.1
General and administrative									64.4	66.7	79.5
OPERATING INCOME									983.2	(1,180.4)	(2,343.4)
OTHER (EXPENSE) INCOME, NET									7.8	41.9	17.1
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES									991.0	(1,138.5)	(2,326.3)
Total provision for income taxes									108.4	176.7	185.4
DISCONTINUED OPERATIONS, NET									8.1	(128.6)	(1,199.2)
EQUITY EARNINGS IN AFFILIATES, NET OF TAX									0.0	0.0	0.0
NET INCOME (LOSS)									890.7	(1,443.8)	(3,710.9)
NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS									(6.9)	(8.9)	(14.1)
NET INCOME (LOSS) ATTRIBUTABLE TO ENSCO									883.8	(1,452.7)	(3,725.0)
Consolidating Adjustments [Member]
Guarantor Obligations [Line Items]
OPERATING REVENUES									(293.3)	(331.2)	(298.4)
Contract drilling (exclusive of depreciation)									(293.3)	(331.2)	(298.4)
Loss on impairment										0.0	0.0
Depreciation									0.0	0.0	0.0
General and administrative									0.0	0.0	0.0
OPERATING INCOME									0.0	0.0	0.0
OTHER (EXPENSE) INCOME, NET									63.1	0.0	0.0
INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE INCOME TAXES									63.1	0.0	0.0
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									(1,104.3)	4,820.5	11,181.4
NET INCOME (LOSS)									(1,041.2)	4,820.5	11,181.4
NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS									0.0	0.0	0.0
NET INCOME (LOSS) ATTRIBUTABLE TO ENSCO									$ (1,041.2)	$ 4,820.5	$ 11,181.4

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