Guarantee Of Registered Securities (Condensed Consolidating Balance Sheets) (Details) (USD $) In Millions	Sep. 30, 2011	Dec. 31, 2010	Sep. 30, 2010	Dec. 31, 2009
Guarantor Obligations [Line Items]
Cash and cash equivalents	$ 479.9	$ 1,050.7	$ 905.2	$ 1,141.4
Accounts receivable	654.9	214.6
Other	379.6	171.4
Total current assets	1,514.4	1,436.7
PROPERTY AND EQUIPMENT, AT COST	14,234.0	6,744.6
Less accumulated depreciation	1,922.3	1,694.7
Property and equipment, net	12,311.7	5,049.9	4,986.1
GOODWILL	3,296.1	336.2
OTHER ASSETS, NET	528.0	228.7
TOTAL ASSETS	17,650.2	7,051.5
Accounts payable and accrued liabilities	1,032.7	331.8
Short-term debt	175.0
Current maturities of long-term debt	47.5	17.2
Total current liabilities	1,255.2	349.0
LONG-TERM DEBT	4,902.1	240.1
DEFERRED INCOME TAXES	355.0	358.0
OTHER LIABILITIES	421.8	139.4
ENSCO SHAREHOLDERS' EQUITY	10,711.1	5,959.5
NONCONTROLLING INTERESTS	5.0	5.5
Total equity	10,716.1	5,965.0
Total liabilities and shareholders' equity	17,650.2	7,051.5
Ensco Plc [Member]
Guarantor Obligations [Line Items]
Cash and cash equivalents	124.2	3.4	5.0	24.8
Accounts receivable from affiliates	3,017.0	28.5
Other	2.9	0.5
Total current assets	3,144.1	32.4
PROPERTY AND EQUIPMENT, AT COST	1.8	1.8
Less accumulated depreciation	0.6	0.3
Property and equipment, net	1.2	1.5
DUE FROM AFFILIATES	1,395.7	1,200.3
INVESTMENTS IN AFFILIATES	10,063.8	5,063.4
OTHER ASSETS, NET	14.5
TOTAL ASSETS	14,619.3	6,297.6
Accounts payable and accrued liabilities	4.9	2.4
Accounts payable to affiliates	540.7	33.4
Short-term debt	175.0
Total current liabilities	720.6	35.8
DUE TO AFFILIATES	1,402.4	922.6
LONG-TERM DEBT	2,464.8
ENSCO SHAREHOLDERS' EQUITY	10,031.5	5,339.2
Total equity	10,031.5	5,339.2
Total liabilities and shareholders' equity	14,619.3	6,297.6
ENSCO International Inc. [Member]
Guarantor Obligations [Line Items]
Cash and cash equivalents	28.7	19.1	134.2	277.8
Accounts receivable	0.2	1.8
Accounts receivable from affiliates	71.5	144.2
Other	71.8	35.2
Total current assets	172.2	200.3
PROPERTY AND EQUIPMENT, AT COST	29.3	24.5
Less accumulated depreciation	23.2	22.0
Property and equipment, net	6.1	2.5
DUE FROM AFFILIATES	2,416.0	2,788.2
INVESTMENTS IN AFFILIATES	2,899.6	2,687.4
OTHER ASSETS, NET	85.6	130.7
TOTAL ASSETS	5,579.5	5,809.1
Accounts payable and accrued liabilities	16.3	12.3
Accounts payable to affiliates	604.2	90.1
Total current liabilities	620.5	102.4
DUE TO AFFILIATES	1,043.3	2,006.7
LONG-TERM DEBT	149.0	148.9
DEFERRED INCOME TAXES	331.6	346.0
OTHER LIABILITIES	5.5	5.1
ENSCO SHAREHOLDERS' EQUITY	3,429.6	3,200.0
Total equity	3,429.6	3,200.0
Total liabilities and shareholders' equity	5,579.5	5,809.1
Pride International Inc [Member]
Guarantor Obligations [Line Items]
Cash and cash equivalents	30.2
Accounts receivable from affiliates	392.3
Other	6.4
Total current assets	428.9
DUE FROM AFFILIATES	1,273.4
INVESTMENTS IN AFFILIATES	5,254.0
TOTAL ASSETS	6,956.3
Accounts payable and accrued liabilities	21.1
Accounts payable to affiliates	152.8
Total current liabilities	173.9
DUE TO AFFILIATES	120.4
LONG-TERM DEBT	2,080.1
DEFERRED INCOME TAXES	39.2
OTHER LIABILITIES	20.5
ENSCO SHAREHOLDERS' EQUITY	4,522.2
Total equity	4,522.2
Total liabilities and shareholders' equity	6,956.3
Other Non-Guarantor Subsidiaries Of Ensco [Member]
Guarantor Obligations [Line Items]
Cash and cash equivalents	296.8	1,028.2	766.0	838.8
Accounts receivable	654.7	212.8
Accounts receivable from affiliates	1,267.6	93.5
Other	298.5	135.7
Total current assets	2,517.6	1,470.2
PROPERTY AND EQUIPMENT, AT COST	14,202.9	6,718.3
Less accumulated depreciation	1,898.5	1,672.4
Property and equipment, net	12,304.4	5,045.9
GOODWILL	3,296.1	336.2
DUE FROM AFFILIATES	2,566.1	2,929.3
OTHER ASSETS, NET	427.9	98.0
TOTAL ASSETS	21,112.1	9,879.6
Accounts payable and accrued liabilities	990.4	317.1
Accounts payable to affiliates	3,450.7	142.7
Current maturities of long-term debt	47.5	17.2
Total current liabilities	4,488.6	477.0
DUE TO AFFILIATES	5,085.1	3,988.5
LONG-TERM DEBT	208.2	91.2
DEFERRED INCOME TAXES	(15.8)	12.0
OTHER LIABILITIES	395.8	134.3
ENSCO SHAREHOLDERS' EQUITY	10,945.2	5,171.1
NONCONTROLLING INTERESTS	5.0	5.5
Total equity	10,950.2	5,176.6
Total liabilities and shareholders' equity	21,112.1	9,879.6
Consolidating Adjustments [Member]
Guarantor Obligations [Line Items]
Cash and cash equivalents
Accounts receivable from affiliates	(4,748.4)	(266.2)
Total current assets	(4,748.4)	(266.2)
DUE FROM AFFILIATES	(7,651.2)	(6,917.8)
INVESTMENTS IN AFFILIATES	(18,217.4)	(7,750.8)
TOTAL ASSETS	(30,617.0)	(14,934.8)
Accounts payable to affiliates	(4,748.4)	(266.2)
Total current liabilities	(4,748.4)	(266.2)
DUE TO AFFILIATES	(7,651.2)	(6,917.8)
ENSCO SHAREHOLDERS' EQUITY	(18,217.4)	(7,750.8)
Total equity	(18,217.4)	(7,750.8)
Total liabilities and shareholders' equity	$ (30,617.0)	$ (14,934.8)

Sum of the carrying values as of the balance sheet date of obligations incurred through that date and due within one year (or the operating cycle, if longer), including liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received, taxes, interest, rent and utilities, accrued salaries and bonuses, payroll taxes and fringe benefits.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 20

-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19

-Article 5

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19,20)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682