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Guarantee Of Registered Securities (Condensed Consolidating Statements Of Cash Flows) (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Guarantor Obligations [Line Items]                      
NET INCOME (LOSS) $ (203.1) $ (142.9) $ (150.1) $ (140.5) $ (207.1) $ (28.2) $ (44.3) $ (24.6) $ (636.6) $ (304.2) $ 897.1
OPERATING ACTIVITIES                      
Net cash provided by operating activities of continuing operations                 (55.7) 259.4 1,077.4
INVESTING ACTIVITIES                      
Maturities of short-term investments                 1,030.0 2,042.5 2,212.0
Purchases of short-term investments                 (919.0) (1,040.0) (2,474.6)
Purchase of Affiliate Debt                 0.0 0.0 0.0
Acquisition of Atwood, net of cash acquired                 0.0 (871.6) 0.0
Sale of affiliate debt                 0.0    
Additions to property and equipment                 (426.7) (536.7) (322.2)
Net proceeds from disposition of assets                 11.0 2.8 9.8
Net cash used in investing activities of continuing operations                 (304.7) (403.0) (575.0)
FINANCING ACTIVITIES                      
Proceeds from issuance of senior notes                 1,000.0 0.0 849.5
Advances (to) from affiliates                 0.0 0.0 0.0
Reduction of long-term borrowings                 (771.2) (537.0) (863.9)
Proceeds from equity issuance                 0.0 0.0 585.5
Cash dividends paid                 (17.9) (13.8) (11.6)
Debt financing costs                 (17.0) (12.0) (23.4)
Other                 (5.7) (7.7) (7.1)
Net cash provided by (used in) financing activities                 188.2 (570.5) 529.0
Net cash provided by (used in) discontinued operations                 2.5 (0.8) 8.4
Effect of exchange rate changes on cash and cash equivalents                 (0.6) 0.6 (1.4)
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS                 (170.3) (714.3) 1,038.4
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR       445.4       1,159.7 445.4 1,159.7 121.3
CASH AND CASH EQUIVALENTS, END OF YEAR 275.1       445.4       275.1 445.4 1,159.7
Ensco Plc [Member]                      
Guarantor Obligations [Line Items]                      
NET INCOME (LOSS)                 (639.7) (303.7) 890.2
OPERATING ACTIVITIES                      
Net cash provided by operating activities of continuing operations                 18.1 (18.2) (101.3)
INVESTING ACTIVITIES                      
Maturities of short-term investments                 1,030.0 1,748.0 2,062.0
Purchases of short-term investments                 (919.0) (1,022.9) (2,047.1)
Purchase of Affiliate Debt                 (551.7) (316.3) (237.9)
Acquisition of Atwood, net of cash acquired                   0.0  
Sale of affiliate debt                 479.0    
Additions to property and equipment                 0.0 0.0 0.0
Net proceeds from disposition of assets                 0.0 0.0
Net cash used in investing activities of continuing operations                 38.3 408.8 (223.0)
FINANCING ACTIVITIES                      
Proceeds from issuance of senior notes                 1,000.0   0.0
Advances (to) from affiliates                 (845.0) (848.9)  
Reduction of long-term borrowings                 (159.9) (220.7) (626.0)
Proceeds from equity issuance                     585.5
Cash dividends paid                 (17.9) (13.8) (11.6)
Debt financing costs                 (17.0) (12.0) (23.4)
Proceeds from Contributions from Affiliates                     1,200.6
Other                 (2.0) (2.6) (2.2)
Net cash provided by (used in) financing activities                 (41.8) (1,098.0) 1,122.9
Net cash provided by (used in) discontinued operations                 0.0 0.0 0.0
Effect of exchange rate changes on cash and cash equivalents                 0.0 0.0 0.0
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS                 14.6 (707.4) 798.6
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR       185.2       892.6 185.2 892.6 94.0
CASH AND CASH EQUIVALENTS, END OF YEAR 199.8       185.2       199.8 185.2 892.6
ENSCO International Inc. [Member]                      
Guarantor Obligations [Line Items]                      
NET INCOME (LOSS)                 (55.6) (79.2) 108.2
OPERATING ACTIVITIES                      
Net cash provided by operating activities of continuing operations                 (135.1) (117.6) (46.5)
INVESTING ACTIVITIES                      
Maturities of short-term investments                 0.0 5.5 0.0
Purchases of short-term investments                 0.0 0.0 (5.5)
Purchase of Affiliate Debt                 0.0 0.0 0.0
Acquisition of Atwood, net of cash acquired                   0.0  
Sale of affiliate debt                 0.0    
Additions to property and equipment                 0.0 0.0 0.0
Net proceeds from disposition of assets                 0.0 0.0 0.0
Net cash used in investing activities of continuing operations                 0.0 5.5 (5.5)
FINANCING ACTIVITIES                      
Proceeds from issuance of senior notes                 0.0   0.0
Reduction of long-term borrowings                 0.0 0.0 0.0
Proceeds from equity issuance                     0.0
Cash dividends paid                 0.0 0.0 0.0
Debt financing costs                 0.0 0.0 0.0
Proceeds from Contributions from Affiliates                 135.1 112.1 52.0
Other                 0.0 0.0 0.0
Net cash provided by (used in) financing activities                 135.1 112.1 52.0
Net cash provided by (used in) discontinued operations                 0.0 0.0 0.0
Effect of exchange rate changes on cash and cash equivalents                 0.0 0.0 0.0
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS                 0.0 0.0 0.0
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR       0.0       0.0 0.0 0.0 0.0
CASH AND CASH EQUIVALENTS, END OF YEAR 0.0       0.0       0.0 0.0 0.0
Pride International Inc. [Member]                      
Guarantor Obligations [Line Items]                      
NET INCOME (LOSS)                 4.3 12.5 49.2
OPERATING ACTIVITIES                      
Net cash provided by operating activities of continuing operations                 (97.6) (100.1) (116.9)
INVESTING ACTIVITIES                      
Maturities of short-term investments                 0.0 0.0 0.0
Purchases of short-term investments                 0.0 0.0 0.0
Purchase of Affiliate Debt                 0.0 0.0 0.0
Acquisition of Atwood, net of cash acquired                   0.0  
Sale of affiliate debt                 0.0    
Additions to property and equipment                 0.0 0.0 0.0
Net proceeds from disposition of assets                 0.0 0.0 0.0
Net cash used in investing activities of continuing operations                 0.0 0.0 0.0
FINANCING ACTIVITIES                      
Proceeds from issuance of senior notes                 0.0   0.0
Reduction of long-term borrowings                 (537.8) 0.0 0.0
Proceeds from equity issuance                     0.0
Cash dividends paid                 0.0 0.0 0.0
Debt financing costs                 0.0 0.0 0.0
Proceeds from Contributions from Affiliates                 612.5 105.9 134.7
Other                 0.0 0.0 0.0
Net cash provided by (used in) financing activities                 74.7 105.9 134.7
Net cash provided by (used in) discontinued operations                 0.0 0.0 0.0
Effect of exchange rate changes on cash and cash equivalents                 0.0 0.0 0.0
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS                 (22.9) 5.8 17.8
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR       25.6       19.8 25.6 19.8 2.0
CASH AND CASH EQUIVALENTS, END OF YEAR 2.7       25.6       2.7 25.6 19.8
Other Non-Guarantor Subsidiaries Of Ensco [Member]                      
Guarantor Obligations [Line Items]                      
NET INCOME (LOSS)                 (352.6) 11.1 890.7
OPERATING ACTIVITIES                      
Net cash provided by operating activities of continuing operations                 158.9 495.3 1,342.1
INVESTING ACTIVITIES                      
Maturities of short-term investments                 0.0 289.0 150.0
Purchases of short-term investments                 0.0 (17.1) (422.0)
Purchase of Affiliate Debt                 0.0 0.0 0.0
Acquisition of Atwood, net of cash acquired                   (871.6)  
Sale of affiliate debt                 0.0    
Additions to property and equipment                 (426.7) (536.7) (322.2)
Net proceeds from disposition of assets                 11.0 2.8 9.8
Net cash used in investing activities of continuing operations                 (415.7) (1,133.6) (584.4)
FINANCING ACTIVITIES                      
Proceeds from issuance of senior notes                 0.0   849.5
Advances (to) from affiliates                     (1,387.3)
Reduction of long-term borrowings                 (0.8) 0.0 0.0
Proceeds from equity issuance                     0.0
Cash dividends paid                 0.0 0.0 0.0
Debt financing costs                 0.0 0.0 0.0
Proceeds from Contributions from Affiliates                 97.4 630.9  
Other                 (3.7) (5.1) (4.9)
Net cash provided by (used in) financing activities                 92.9 625.8 (542.7)
Net cash provided by (used in) discontinued operations                 2.5 (0.8) 8.4
Effect of exchange rate changes on cash and cash equivalents                 (0.6) 0.6 (1.4)
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS                 (162.0) (12.7) 222.0
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR       234.6       247.3 234.6 247.3 25.3
CASH AND CASH EQUIVALENTS, END OF YEAR 72.6       234.6       72.6 234.6 247.3
Consolidating Adjustments [Member]                      
Guarantor Obligations [Line Items]                      
NET INCOME (LOSS)                 407.0 55.1 (1,041.2)
OPERATING ACTIVITIES                      
Net cash provided by operating activities of continuing operations                 0.0 0.0 0.0
INVESTING ACTIVITIES                      
Maturities of short-term investments                 0.0 0.0 0.0
Purchases of short-term investments                 0.0 0.0 0.0
Purchase of Affiliate Debt                 551.7 316.3 237.9
Acquisition of Atwood, net of cash acquired                   0.0  
Sale of affiliate debt                 (479.0)    
Additions to property and equipment                 0.0 0.0 0.0
Net proceeds from disposition of assets                 0.0 0.0 0.0
Net cash used in investing activities of continuing operations                 72.7 316.3 237.9
FINANCING ACTIVITIES                      
Proceeds from issuance of senior notes                 0.0   0.0
Advances (to) from affiliates                 0.0 0.0 0.0
Reduction of long-term borrowings                 (72.7) (316.3) (237.9)
Proceeds from equity issuance                     0.0
Cash dividends paid                 0.0 0.0 0.0
Debt financing costs                 0.0 0.0 0.0
Other                 0.0 0.0 0.0
Net cash provided by (used in) financing activities                 (72.7) (316.3) (237.9)
Net cash provided by (used in) discontinued operations                 0.0 0.0 0.0
Effect of exchange rate changes on cash and cash equivalents                 0.0 0.0 0.0
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS                 0.0 0.0 0.0
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR       $ 0.0       $ 0.0 0.0 0.0 0.0
CASH AND CASH EQUIVALENTS, END OF YEAR $ 0.0       $ 0.0       $ 0.0 $ 0.0 $ 0.0