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Benefit Plans (Summary Of Non-Vested Share Award Related Compensation Expense Recognized) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Tax benefit	$ (5.1)us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	$ (5.4)us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	$ (7.0)us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
Total non-vested share award related compensation expense included in net income	36.5us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax	37.5us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax	34.9us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax
Contract Drilling [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Non-vested share award related compensation expense	20.9us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = esv_ContractDrillingMember	21.3us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = esv_ContractDrillingMember	17.1us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = esv_ContractDrillingMember
General And Administrative [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Non-vested share award related compensation expense	20.7us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_GeneralAndAdministrativeExpenseMember	21.6us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_GeneralAndAdministrativeExpenseMember	24.8us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_GeneralAndAdministrativeExpenseMember
Operating Expenses [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Non-vested share award related compensation expense	$ 41.6us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = esv_OperatingExpensesMember	$ 42.9us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = esv_OperatingExpensesMember	$ 41.9us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = esv_OperatingExpensesMember

X

- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SAB TOPIC 14.F)

-URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (h)(1)(i)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 14

-Section F

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	debit
Period Type:	duration

X

- Definition

The amount of expense, net of income tax, recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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Period Type:	duration

X

- Definition

The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (h)(1)(i)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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