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Guarantee Of Registered Securities (Condensed Consolidating Statements Of Cash Flows) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
OPERATING ACTIVITIES    
Net cash (used in) provided by operating activities of continuing operations $ 39.5 $ 104.6
Maturities of short-term investments 390.0 602.0
INVESTING ACTIVITIES    
Purchases of short-term investments (349.0) (965.0)
Additions to property and equipment (269.3) (282.6)
Purchase of Affiliate Debt 0.0 0.0
Sale of Affiliate Debt 0.0  
Other 0.1 0.2
Net cash used in investing activities of continuing operations (228.2) (645.4)
FINANCING ACTIVITIES    
Proceeds from Issuance of senior notes 1,000.0 0.0
Reduction of long-term borrowings (771.0) (336.6)
Debt financing costs (16.8) (4.5)
Cash dividends paid (4.5) (3.2)
Payments for Advance to Affiliate 0.0 0.0
Other (1.2) (2.4)
Net cash provided by (used in) financing activities 206.5 (346.7)
Net cash provided by (used in) discontinued operations 2.5 (0.6)
Effect of exchange rate changes on cash and cash equivalents (0.3) 0.1
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS 20.0 (888.0)
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD 445.4 1,159.7
CASH AND CASH EQUIVALENTS, END OF PERIOD 465.4 271.7
Ensco Plc [Member]    
OPERATING ACTIVITIES    
Net cash (used in) provided by operating activities of continuing operations 18.0 0.2
Maturities of short-term investments 390.0 330.0
INVESTING ACTIVITIES    
Purchases of short-term investments (349.0) (965.0)
Additions to property and equipment 0.0 0.0
Purchase of Affiliate Debt (552.5) (151.1)
Sale of Affiliate Debt 479.0  
Other 0.0 0.0
Net cash used in investing activities of continuing operations (32.5) (786.1)
FINANCING ACTIVITIES    
Proceeds from Issuance of senior notes 1,000.0  
Reduction of long-term borrowings (159.7) (185.5)
Debt financing costs (16.8) (4.5)
Cash dividends paid (4.5) (3.2)
Payments for Advance to Affiliate 666.7  
Proceeds from Contributions from Affiliates   268.2
Other (1.2) (1.5)
Net cash provided by (used in) financing activities 151.1 73.5
Net cash provided by (used in) discontinued operations 0.0 0.0
Effect of exchange rate changes on cash and cash equivalents 0.0 0.0
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS 136.6 (712.4)
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD 185.2 892.6
CASH AND CASH EQUIVALENTS, END OF PERIOD 321.8 180.2
ENSCO International Inc. [Member]    
OPERATING ACTIVITIES    
Net cash (used in) provided by operating activities of continuing operations (36.9) (19.5)
Maturities of short-term investments 0.0 0.0
INVESTING ACTIVITIES    
Purchases 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
Sale of Affiliate Debt 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 notes 0.0  
Reduction of long-term borrowings 0.0 0.0
Debt financing costs 0.0 0.0
Cash dividends paid 0.0 0.0
Proceeds from Contributions from Affiliates 36.9 19.5
Other 0.0 0.0
Net cash provided by (used in) financing activities 36.9 19.5
Net cash provided by (used in) discontinued operations 0.0 0.0
Effect of exchange rate changes on cash and cash equivalents 0.0 0.0
INCREASE (DECREASE) 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 (45.0) (41.3)
Maturities of short-term investments 0.0 0.0
INVESTING ACTIVITIES    
Purchases 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
Sale of Affiliate Debt 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 notes 0.0  
Reduction of long-term borrowings (537.8) 0.0
Debt financing costs 0.0 0.0
Cash dividends paid 0.0 0.0
Proceeds from Contributions from Affiliates 571.7 37.0
Other 0.0 0.0
Net cash provided by (used in) financing activities 33.9 37.0
Net cash provided by (used in) discontinued operations 0.0 0.0
Effect of exchange rate changes on cash and cash equivalents 0.0 0.0
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS (11.1) (4.3)
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD 25.6 19.8
CASH AND CASH EQUIVALENTS, END OF PERIOD 14.5 15.5
Other Non-Guarantor Subsidiaries Of Ensco [Member]    
OPERATING ACTIVITIES    
Net cash (used in) provided by operating activities of continuing operations 103.4 165.2
Maturities of short-term investments 0.0 272.0
INVESTING ACTIVITIES    
Purchases of short-term investments 0.0 0.0
Additions to property and equipment (269.3) (282.6)
Purchase of Affiliate Debt 0.0 0.0
Sale of Affiliate Debt 0.0  
Other 0.1 0.2
Net cash used in investing activities of continuing operations (269.2) (10.4)
FINANCING ACTIVITIES    
Proceeds from Issuance of senior notes 0.0  
Reduction of long-term borrowings 0.0 0.0
Debt financing costs 0.0 0.0
Cash dividends paid 0.0 0.0
Payments for Advance to Affiliate   324.7
Proceeds from Contributions from Affiliates 58.1  
Other 0.0 (0.9)
Net cash provided by (used in) financing activities 58.1 (325.6)
Net cash provided by (used in) discontinued operations 2.5 (0.6)
Effect of exchange rate changes on cash and cash equivalents (0.3) 0.1
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS (105.5) (171.3)
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD 234.6 247.3
CASH AND CASH EQUIVALENTS, END OF PERIOD 129.1 76.0
Consolidating Adjustments [Member]    
OPERATING ACTIVITIES    
Net cash (used in) provided by operating activities of continuing operations 0.0 0.0
Maturities of short-term investments 0.0 0.0
INVESTING ACTIVITIES    
Purchases of short-term investments 0.0 0.0
Additions to property and equipment 0.0 0.0
Purchase of Affiliate Debt 552.5 151.1
Sale of Affiliate Debt (479.0)  
Other 0.0 0.0
Net cash used in investing activities of continuing operations 73.5 151.1
FINANCING ACTIVITIES    
Proceeds from Issuance of senior notes 0.0  
Reduction of long-term borrowings (73.5) (151.1)
Debt financing costs 0.0 0.0
Cash dividends paid 0.0 0.0
Payments for Advance to Affiliate   0.0
Proceeds from Contributions from Affiliates 0.0  
Other 0.0 0.0
Net cash provided by (used in) financing activities (73.5) (151.1)
Net cash provided by (used in) discontinued operations 0.0 0.0
Effect of exchange rate changes on cash and cash equivalents 0.0 0.0
INCREASE (DECREASE) 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