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Guarantee Of Registered Securities (Condensed Consolidating Statements Of Cash Flows) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
OPERATING ACTIVITIES    
Net cash (used in) provided by operating activities of continuing operations $ 104.6 $ 233.1
INVESTING ACTIVITIES    
Payments for (Proceeds from) Short-term Investments (965.0) (80.0)
Proceeds from Sale of Short-term Investments 602.0 965.0
Additions to property and equipment (282.6) (158.1)
Purchase of Affiliate Debt 0.0  
Other 0.2 0.1
Net cash (used in) provided by investing activities of continuing operations (645.4) 727.0
FINANCING ACTIVITIES    
Reduction of long-term borrowings (336.6) 0.0
Payments of Financing Costs (4.5) 0.0
Cash dividends paid (3.2) (2.4)
Advances from (to) affiliates 0.0 0.0
Other (2.4) (0.5)
Net cash used in financing activities (346.7) (2.9)
Net cash provided by discontinued operations (0.6) 5.6
Effect of exchange rate changes on cash and cash equivalents 0.1 (0.1)
(DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS (888.0) 962.7
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD 1,159.7 121.3
CASH AND CASH EQUIVALENTS, END OF PERIOD 271.7 1,084.0
Ensco Plc [Member]    
OPERATING ACTIVITIES    
Net cash (used in) provided by operating activities of continuing operations 0.2 (46.3)
INVESTING ACTIVITIES    
Payments for (Proceeds from) Short-term Investments (965.0) (80.0)
Proceeds from Sale of Short-term Investments 330.0 965.0
Additions to property and equipment 0.0 0.0
Purchase of Affiliate Debt (151.1)  
Other 0.0 0.0
Net cash (used in) provided by investing activities of continuing operations (786.1) 885.0
FINANCING ACTIVITIES    
Reduction of long-term borrowings (185.5)  
Payments of Financing Costs (4.5)  
Cash dividends paid (3.2) (2.4)
Advances from (to) affiliates 268.2 119.8
Other (1.5) (0.4)
Net cash used in financing activities 73.5 117.0
Net cash 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 (712.4) 955.7
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD 892.6 94.0
CASH AND CASH EQUIVALENTS, END OF PERIOD 180.2 1,049.7
ENSCO International Inc. [Member]    
OPERATING ACTIVITIES    
Net cash (used in) provided by operating activities of continuing operations (19.5) 0.7
INVESTING ACTIVITIES    
Payments for (Proceeds from) Short-term Investments 0.0 0.0
Proceeds from Sale of Short-term Investments 0.0 0.0
Additions to property and equipment 0.0 0.0
Purchase of Affiliate Debt 0.0  
Other 0.0 0.0
Net cash (used in) provided by investing activities of continuing operations 0.0 0.0
FINANCING ACTIVITIES    
Reduction of long-term borrowings 0.0  
Payments of Financing Costs 0.0  
Cash dividends paid 0.0 0.0
Advances from (to) affiliates 19.5 (0.7)
Other 0.0 0.0
Net cash used in financing activities 19.5 (0.7)
Net cash 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 (41.3) (39.2)
INVESTING ACTIVITIES    
Payments for (Proceeds from) Short-term Investments 0.0 0.0
Proceeds from Sale of Short-term Investments 0.0 0.0
Additions to property and equipment 0.0 0.0
Purchase of Affiliate Debt 0.0  
Other 0.0 0.0
Net cash (used in) provided by investing activities of continuing operations 0.0 0.0
FINANCING ACTIVITIES    
Reduction of long-term borrowings 0.0  
Payments of Financing Costs 0.0  
Cash dividends paid 0.0 0.0
Advances from (to) affiliates 37.0 39.2
Other 0.0 0.0
Net cash used in financing activities 37.0 39.2
Net cash 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 (4.3) 0.0
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD 19.8 2.0
CASH AND CASH EQUIVALENTS, END OF PERIOD 15.5 2.0
Other Non-Guarantor Subsidiaries Of Ensco [Member]    
OPERATING ACTIVITIES    
Net cash (used in) provided by operating activities of continuing operations 165.2 317.9
INVESTING ACTIVITIES    
Payments for (Proceeds from) Short-term Investments 0.0 0.0
Proceeds from Sale of Short-term Investments 272.0 0.0
Additions to property and equipment (282.6) (158.1)
Purchase of Affiliate Debt 0.0  
Other 0.2 0.1
Net cash (used in) provided by investing activities of continuing operations (10.4) (158.0)
FINANCING ACTIVITIES    
Reduction of long-term borrowings 0.0  
Payments of Financing Costs 0.0  
Cash dividends paid 0.0 0.0
Advances from (to) affiliates (324.7) (158.3)
Other (0.9) (0.1)
Net cash used in financing activities (325.6) (158.4)
Net cash provided by discontinued operations (0.6) 5.6
Effect of exchange rate changes on cash and cash equivalents 0.1 (0.1)
(DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS (171.3) 7.0
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD 247.3 25.3
CASH AND CASH EQUIVALENTS, END OF PERIOD 76.0 32.3
Consolidating Adjustments [Member]    
OPERATING ACTIVITIES    
Net cash (used in) provided by operating activities of continuing operations 0.0 0.0
INVESTING ACTIVITIES    
Payments for (Proceeds from) Short-term Investments 0.0 0.0
Proceeds from Sale of Short-term Investments 0.0 0.0
Additions to property and equipment 0.0 0.0
Purchase of Affiliate Debt 151.1  
Other 0.0 0.0
Net cash (used in) provided by investing activities of continuing operations 151.1 0.0
FINANCING ACTIVITIES    
Reduction of long-term borrowings (151.1)  
Payments of Financing Costs 0.0  
Cash dividends paid 0.0 0.0
Advances from (to) affiliates 0.0 0.0
Other 0.0 0.0
Net cash used in financing activities (151.1) 0.0
Net cash 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