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Guarantee Of Registered Securities (Condensed Consolidating Statements Of Cash Flows) (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
OPERATING ACTIVITIES
Net cash (used in) provided by operating activities of continuing operations	$ 130.5	$ 800.2
INVESTING ACTIVITIES
Purchases of short-term investments	(1,134.8)	(862.0)
Maturities of short-term investments	897.0	1,032.0
Additions to property and equipment	(332.6)	(209.4)
Purchase of affiliate debt	0.0	0.0
Other	1.7	7.6
Net cash used in investing activities of continuing operations	(568.7)	(31.8)
FINANCING ACTIVITIES
Proceeds from Issuance of Senior Long-term Debt		585.5
Reduction of long-term borrowings	(537.0)	(684.8)
Cash dividends paid	(6.2)	(5.5)
Debt financing costs	(5.5)	0.0
Advances from (to) affiliates	0.0	0.0
Other	(3.6)	(1.9)
Net cash used in financing activities	(552.3)	(106.7)
Net cash (used in) provided by discontinued operations	(0.2)	7.7
Effect of exchange rate changes on cash and cash equivalents	0.6	(0.4)
(DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	(990.1)	669.0
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	1,159.7	121.3
CASH AND CASH EQUIVALENTS, END OF PERIOD	169.6	790.3
Ensco Plc [Member]
OPERATING ACTIVITIES
Net cash (used in) provided by operating activities of continuing operations	(17.8)	(83.4)
INVESTING ACTIVITIES
Purchases of short-term investments	(563.0)	(862.0)
Maturities of short-term investments	65.1	1,032.0
Additions to property and equipment	0.0	0.0
Purchase of affiliate debt	(316.3)	(142.0)
Other	0.0	0.0
Net cash used in investing activities of continuing operations	(814.2)	28.0
FINANCING ACTIVITIES
Proceeds from Issuance of Senior Long-term Debt		585.5
Reduction of long-term borrowings	(220.7)	(542.8)
Cash dividends paid	(6.2)	(5.5)
Debt financing costs	(5.5)
Advances from (to) affiliates	247.7	638.9
Other	(2.6)	(1.9)
Net cash used in financing activities	12.7	674.2
Net cash (used in) provided by discontinued operations	0.0	0.0
Effect of exchange rate changes on cash and cash equivalents	0.0	0.0
(DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	(819.3)	618.8
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	892.6	94.0
CASH AND CASH EQUIVALENTS, END OF PERIOD	73.3	712.8
ENSCO International Inc. [Member]
OPERATING ACTIVITIES
Net cash (used in) provided by operating activities of continuing operations	(50.5)	130.8
INVESTING ACTIVITIES
Purchases of short-term investments	0.0	0.0
Maturities of short-term investments	0.0	0.0
Additions to property and equipment	0.0	0.0
Purchase of affiliate debt	0.0	0.0
Other	0.0	0.0
Net cash used in investing activities of continuing operations	0.0	0.0
FINANCING ACTIVITIES
Proceeds from Issuance of Senior Long-term Debt		0.0
Reduction of long-term borrowings	0.0	0.0
Cash dividends paid	0.0	0.0
Debt financing costs	0.0
Advances from (to) affiliates	50.5
Payments for Advance to Affiliate		(130.8)
Other	0.0	0.0
Net cash used in financing activities	50.5	(130.8)
Net cash (used in) provided by discontinued operations	0.0	0.0
Effect of exchange rate changes on cash and cash equivalents	0.0	0.0
(DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	0.0	0.0
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	0.0	0.0
CASH AND CASH EQUIVALENTS, END OF PERIOD	0.0	0.0
Pride International, Inc. [Member]
OPERATING ACTIVITIES
Net cash (used in) provided by operating activities of continuing operations	(53.9)	(60.4)
INVESTING ACTIVITIES
Purchases of short-term investments	0.0	0.0
Maturities of short-term investments	0.0	0.0
Additions to property and equipment	0.0	0.0
Purchase of affiliate debt	0.0	0.0
Other	0.0	0.0
Net cash used in investing activities of continuing operations	0.0	0.0
FINANCING ACTIVITIES
Proceeds from Issuance of Senior Long-term Debt		0.0
Reduction of long-term borrowings	0.0	0.0
Cash dividends paid	0.0	0.0
Debt financing costs	0.0
Advances from (to) affiliates	37.9	84.5
Other	0.0	0.0
Net cash used in financing activities	37.9	84.5
Net cash (used in) provided by discontinued operations	0.0	0.0
Effect of exchange rate changes on cash and cash equivalents	0.0	0.0
(DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	(16.0)	24.1
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	19.8	2.0
CASH AND CASH EQUIVALENTS, END OF PERIOD	3.8	26.1
Other Non-Guarantor Subsidiaries Of Ensco [Member]
OPERATING ACTIVITIES
Net cash (used in) provided by operating activities of continuing operations	252.7	813.2
INVESTING ACTIVITIES
Purchases of short-term investments	(571.8)	0.0
Maturities of short-term investments	831.9	0.0
Additions to property and equipment	(332.6)	(209.4)
Purchase of affiliate debt	0.0	0.0
Other	1.7	7.6
Net cash used in investing activities of continuing operations	(70.8)	(201.8)
FINANCING ACTIVITIES
Proceeds from Issuance of Senior Long-term Debt		0.0
Reduction of long-term borrowings	0.0	0.0
Cash dividends paid	0.0	0.0
Debt financing costs	0.0
Payments for Advance to Affiliate	(336.1)	(592.6)
Other	(1.0)	0.0
Net cash used in financing activities	(337.1)	(592.6)
Net cash (used in) provided by discontinued operations	(0.2)	7.7
Effect of exchange rate changes on cash and cash equivalents	0.6	(0.4)
(DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	(154.8)	26.1
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	247.3	25.3
CASH AND CASH EQUIVALENTS, END OF PERIOD	92.5	51.4
Consolidating Adjustments [Member]
OPERATING ACTIVITIES
Net cash (used in) provided by operating activities of continuing operations	0.0	0.0
INVESTING ACTIVITIES
Purchases of short-term investments	0.0	0.0
Maturities of short-term investments	0.0	0.0
Additions to property and equipment	0.0	0.0
Purchase of affiliate debt	316.3	142.0
Other	0.0	0.0
Net cash used in investing activities of continuing operations	316.3	142.0
FINANCING ACTIVITIES
Proceeds from Issuance of Senior Long-term Debt		0.0
Reduction of long-term borrowings	(316.3)	(142.0)
Cash dividends paid	0.0	0.0
Debt financing costs	0.0
Advances from (to) affiliates	0.0	0.0
Other	0.0	0.0
Net cash used in financing activities	(316.3)	(142.0)
Net cash (used in) provided by discontinued operations	0.0	0.0
Effect of exchange rate changes on cash and cash equivalents	0.0	0.0
(DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	0.0	0.0
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	0.0	0.0
CASH AND CASH EQUIVALENTS, END OF PERIOD	$ 0.0	$ 0.0

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