Guarantee Of Registered Securities (Condensed Consolidating Balance Sheets) (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014	Dec. 31, 2013
Guarantor Obligations [Line Items]
Cash and cash equivalents	$ 887,800,000	$ 664,800,000	$ 122,500,000	$ 165,600,000
Short-term Investments	745,300,000us-gaap_ShortTermInvestments	757,300,000us-gaap_ShortTermInvestments
Accounts receivable, net	795,400,000us-gaap_ReceivablesNetCurrent	883,300,000us-gaap_ReceivablesNetCurrent
Accounts receivable from affiliates	0	0
Other	625,300,000us-gaap_OtherAssetsCurrent	629,400,000us-gaap_OtherAssetsCurrent
Total current assets	3,053,800,000us-gaap_AssetsCurrent	2,934,800,000us-gaap_AssetsCurrent
PROPERTY AND EQUIPMENT, AT COST	15,303,000,000us-gaap_PropertyPlantAndEquipmentGross	14,975,500,000us-gaap_PropertyPlantAndEquipmentGross
Less accumulated depreciation	2,577,700,000	2,440,700,000
Property and equipment, net	12,725,300,000us-gaap_PropertyPlantAndEquipmentNet	12,534,800,000us-gaap_PropertyPlantAndEquipmentNet	14,418,300,000us-gaap_PropertyPlantAndEquipmentNet
GOODWILL	276,100,000us-gaap_Goodwill	276,100,000us-gaap_Goodwill
DUE FROM AFFILIATES	0us-gaap_DueFromAffiliateNoncurrent	0us-gaap_DueFromAffiliateNoncurrent
INVESTMENTS IN AFFILIATES	0	0
OTHER ASSETS, NET	291,000,000us-gaap_OtherAssetsNoncurrent	314,200,000us-gaap_OtherAssetsNoncurrent
TOTAL ASSETS	16,346,200,000us-gaap_Assets	16,059,900,000us-gaap_Assets
Accounts payable and accrued liabilities	922,100,000	1,069,800,000
Accounts payable to affiliates	0	0
Current maturities of long-term debt	211,500,000us-gaap_LongTermDebtCurrent	34,800,000us-gaap_LongTermDebtCurrent
Total current liabilities	1,133,600,000us-gaap_LiabilitiesCurrent	1,104,600,000us-gaap_LiabilitiesCurrent
DUE TO AFFILIATES	0us-gaap_DueToRelatedPartiesNoncurrent	0us-gaap_DueToRelatedPartiesNoncurrent
LONG-TERM DEBT	5,919,300,000us-gaap_LongTermDebtNoncurrent	5,885,600,000us-gaap_LongTermDebtNoncurrent
DEFERRED INCOME TAXES	182,100,000	179,500,000
OTHER LIABILITIES	596,100,000us-gaap_OtherLiabilitiesNoncurrent	667,300,000us-gaap_OtherLiabilitiesNoncurrent
ENSCO SHAREHOLDERS' EQUITY	8,504,500,000us-gaap_StockholdersEquity	8,215,000,000us-gaap_StockholdersEquity
NONCONTROLLING INTERESTS	10,600,000us-gaap_MinorityInterest	7,900,000us-gaap_MinorityInterest
Total equity	8,515,100,000	8,222,900,000
Total liabilities and shareholders' equity	16,346,200,000	16,059,900,000
Ensco Plc [Member]
Guarantor Obligations [Line Items]
Cash and cash equivalents	286,500,000	287,400,000	38,100,000	46,500,000
Short-term Investments	712,000,000	712,000,000
Accounts receivable, net	0	0
Accounts receivable from affiliates	16,800,000	34,500,000
Other	3,300,000	4,100,000
Total current assets	1,018,600,000	1,038,000,000
PROPERTY AND EQUIPMENT, AT COST	2,100,000	2,100,000
Less accumulated depreciation	1,800,000	1,700,000
Property and equipment, net	300,000	400,000
GOODWILL	0	0
DUE FROM AFFILIATES	3,703,100,000	2,873,200,000
INVESTMENTS IN AFFILIATES	9,484,200,000	9,084,800,000
OTHER ASSETS, NET	25,800,000	17,000,000
TOTAL ASSETS	14,232,000,000	13,013,400,000
Accounts payable and accrued liabilities	52,300,000	47,800,000
Accounts payable to affiliates	14,800,000	23,500,000
Current maturities of long-term debt	145,500,000	0
Total current liabilities	212,600,000	71,300,000
DUE TO AFFILIATES	1,698,500,000	994,800,000
LONG-TERM DEBT	3,805,800,000	3,724,400,000
DEFERRED INCOME TAXES	0	0
OTHER LIABILITIES	0	0
ENSCO SHAREHOLDERS' EQUITY	8,515,100,000	8,222,900,000
NONCONTROLLING INTERESTS	0	0
Total equity	8,515,100,000	8,222,900,000
Total liabilities and shareholders' equity	14,232,000,000	13,013,400,000
ENSCO International Inc. [Member]
Guarantor Obligations [Line Items]
Cash and cash equivalents	0	0	0	500,000
Short-term Investments	0	0
Accounts receivable, net	0	0
Accounts receivable from affiliates	121,800,000	210,400,000
Other	70,200,000	86,900,000
Total current assets	192,000,000	297,300,000
PROPERTY AND EQUIPMENT, AT COST	76,600,000	71,500,000
Less accumulated depreciation	36,500,000	34,100,000
Property and equipment, net	40,100,000	37,400,000
GOODWILL	0	0
DUE FROM AFFILIATES	4,952,700,000	4,748,200,000
INVESTMENTS IN AFFILIATES	1,280,600,000	1,233,500,000
OTHER ASSETS, NET	46,400,000	47,400,000
TOTAL ASSETS	6,511,800,000	6,363,800,000
Accounts payable and accrued liabilities	54,500,000	42,800,000
Accounts payable to affiliates	60,000,000	158,300,000
Current maturities of long-term debt	0	0
Total current liabilities	114,500,000	201,100,000
DUE TO AFFILIATES	4,037,900,000	3,817,400,000
LONG-TERM DEBT	149,200,000	149,200,000
DEFERRED INCOME TAXES	178,700,000	176,800,000
OTHER LIABILITIES	7,000,000	6,100,000
ENSCO SHAREHOLDERS' EQUITY	2,024,500,000	2,013,200,000
NONCONTROLLING INTERESTS	0	0
Total equity	2,024,500,000	2,013,200,000
Total liabilities and shareholders' equity	6,511,800,000	6,363,800,000
Pride International, Inc. [Member]
Guarantor Obligations [Line Items]
Cash and cash equivalents	249,400,000	90,800,000	2,200,000	4,900,000
Short-term Investments	0	0
Accounts receivable, net	0	0
Accounts receivable from affiliates	0	0
Other	0	0
Total current assets	249,400,000	90,800,000
PROPERTY AND EQUIPMENT, AT COST	0	0
Less accumulated depreciation	0	0
Property and equipment, net	0	0
GOODWILL	0	0
DUE FROM AFFILIATES	1,806,600,000	1,835,000,000
INVESTMENTS IN AFFILIATES	525,300,000	461,600,000
OTHER ASSETS, NET	0	0
TOTAL ASSETS	2,581,300,000	2,387,400,000
Accounts payable and accrued liabilities	23,500,000	34,300,000
Accounts payable to affiliates	0	0
Current maturities of long-term debt	0	0
Total current liabilities	23,500,000	34,300,000
DUE TO AFFILIATES	1,712,000,000	1,547,700,000
LONG-TERM DEBT	1,964,300,000	1,973,200,000
DEFERRED INCOME TAXES	0	0
OTHER LIABILITIES	6,300,000	7,000,000
ENSCO SHAREHOLDERS' EQUITY	(1,124,800,000)	(1,174,800,000)
NONCONTROLLING INTERESTS	0	0
Total equity	(1,124,800,000)	(1,174,800,000)
Total liabilities and shareholders' equity	2,581,300,000	2,387,400,000
Other Non-Guarantor Subsidiaries Of Ensco [Member]
Guarantor Obligations [Line Items]
Cash and cash equivalents	351,900,000	286,600,000	82,200,000	113,700,000
Short-term Investments	33,300,000	45,300,000
Accounts receivable, net	795,400,000	883,300,000
Accounts receivable from affiliates	63,200,000	134,600,000
Other	551,800,000	538,400,000
Total current assets	1,795,600,000	1,888,200,000
PROPERTY AND EQUIPMENT, AT COST	15,224,300,000	14,901,900,000
Less accumulated depreciation	2,539,400,000	2,404,900,000
Property and equipment, net	12,684,900,000	12,497,000,000
GOODWILL	276,100,000	276,100,000
DUE FROM AFFILIATES	7,398,300,000	6,308,800,000
INVESTMENTS IN AFFILIATES	0	0
OTHER ASSETS, NET	218,800,000	249,800,000
TOTAL ASSETS	22,373,700,000	21,219,900,000
Accounts payable and accrued liabilities	791,800,000	944,900,000
Accounts payable to affiliates	127,000,000	197,700,000
Current maturities of long-term debt	66,000,000	34,800,000
Total current liabilities	984,800,000	1,177,400,000
DUE TO AFFILIATES	10,412,300,000	9,405,300,000
LONG-TERM DEBT	0	38,800,000
DEFERRED INCOME TAXES	3,400,000	2,700,000
OTHER LIABILITIES	582,800,000	654,200,000
ENSCO SHAREHOLDERS' EQUITY	10,379,800,000	9,933,600,000
NONCONTROLLING INTERESTS	10,600,000	7,900,000
Total equity	10,390,400,000	9,941,500,000
Total liabilities and shareholders' equity	22,373,700,000	21,219,900,000
Consolidating Adjustments [Member]
Guarantor Obligations [Line Items]
Cash and cash equivalents	0	0	0	0
Short-term Investments	0	0
Accounts receivable, net	0	0
Accounts receivable from affiliates	(201,800,000)	(379,500,000)
Other	0	0
Total current assets	(201,800,000)	(379,500,000)
PROPERTY AND EQUIPMENT, AT COST	0	0
Less accumulated depreciation	0	0
Property and equipment, net	0	0
GOODWILL	0	0
DUE FROM AFFILIATES	(17,860,700,000)	(15,765,200,000)
INVESTMENTS IN AFFILIATES	(11,290,100,000)	(10,779,900,000)
OTHER ASSETS, NET	0	0
TOTAL ASSETS	(29,352,600,000)	(26,924,600,000)
Accounts payable and accrued liabilities	0	0
Accounts payable to affiliates	(201,800,000)	(379,500,000)
Current maturities of long-term debt	0	0
Total current liabilities	(201,800,000)	(379,500,000)
DUE TO AFFILIATES	(17,860,700,000)	(15,765,200,000)
LONG-TERM DEBT	0	0
DEFERRED INCOME TAXES	0	0
OTHER LIABILITIES	0	0
ENSCO SHAREHOLDERS' EQUITY	(11,290,100,000)	(10,779,900,000)
NONCONTROLLING INTERESTS	0	0
Total equity	(11,290,100,000)	(10,779,900,000)
Total liabilities and shareholders' equity	$ (29,352,600,000)	$ (26,924,600,000)

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.

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Amount for accounts payable to related parties. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Carrying amount of long-term debt, net of unamortized discount or premium, excluding amounts to be repaid within one year or the normal operating cycle, if longer (current maturities). Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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The total amount due to the entity within one year of the balance sheet date (or one operating cycle, if longer) from outside sources, including trade accounts receivable, notes and loans receivable, as well as any other types of receivables, net of allowances established for the purpose of reducing such receivables to an amount that approximates their net realizable value.

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Investments which are intended to be sold in the short term (usually less than one year or the normal operating cycle, whichever is longer) including trading securities, available-for-sale securities, held-to-maturity securities, and other short-term investments not otherwise listed in the existing taxonomy.

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Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity.

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