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Supplemental Financial Information (Accrued Liabilities And Other) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Supplemental Financial Information [Abstract]
Personnel costs	$ 214.0us-gaap_EmployeeRelatedLiabilitiesCurrent	$ 242.0us-gaap_EmployeeRelatedLiabilitiesCurrent
Deferred revenue	241.3us-gaap_DeferredRevenueCurrent	169.8us-gaap_DeferredRevenueCurrent
Taxes	97.0us-gaap_TaxesPayableCurrent	84.2us-gaap_TaxesPayableCurrent
Accrued interest	83.8us-gaap_InterestPayableCurrent	68.0us-gaap_InterestPayableCurrent
Prepayment Liability for Sale of Assets, Current	0esv_PrepaymentLiabilityforSaleofAssetsCurrent	33.0esv_PrepaymentLiabilityforSaleofAssetsCurrent
Derivative Liability	24.1us-gaap_DerivativeLiabilities	10.4us-gaap_DerivativeLiabilities
Customer Prepayments, Current	0esv_CustomerPrepaymentsCurrent	20.0esv_CustomerPrepaymentsCurrent
Other	36.4esv_LiabilitiesCurrentOther	31.3esv_LiabilitiesCurrentOther
Accrued liabilities and other	$ 696.6us-gaap_OtherLiabilitiesCurrent	$ 658.7us-gaap_OtherLiabilitiesCurrent

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Customer Prepayments, Current

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Liabilities Current Other

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Prepayment Liability for Sale of Assets, Current

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The carrying amount of consideration received or receivable as of the balance sheet date on potential earnings that were not recognized as revenue in conformity with GAAP, and which are expected to be recognized as such within one year or the normal operating cycle, if longer, including sales, license fees, and royalties, but excluding interest income.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 605

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SAB TOPIC 13.A.4(a).Q1)

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-Section 45

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Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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Total of the carrying values as of the balance sheet date of obligations incurred through that date and payable for obligations related to services received from employees, such as accrued salaries and bonuses, payroll taxes and fringe benefits. 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 value as of the balance sheet date of [accrued] interest payable on all forms of debt, including trade payables, that has been incurred and is unpaid. 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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Aggregate carrying amount of current liabilities (due within one year or within the normal operating cycle if longer) not separately disclosed in the balance sheet. Includes costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered and of liabilities not separately disclosed.

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Carrying value as of the balance sheet date of obligations incurred and payable for statutory income, sales, use, payroll, excise, real, property and other taxes. 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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