Income Taxes (Summary Of Significant Components Of Deferred Income Tax Assets (Liabilities)) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Foreign tax credits	$ 98.6	$ 159.0
Premium on long-term debt	99.2	111.9
Net operating loss carryfowards	204.5	104.0
Employee benefits, including share-based compensation	39.5	41.7
Deferred revenue	103.0us-gaap_DeferredTaxAssetsDeferredIncome	19.4us-gaap_DeferredTaxAssetsDeferredIncome
Other	16.7us-gaap_DeferredTaxAssetsOther	19.8us-gaap_DeferredTaxAssetsOther
Total deferred tax assets	561.5us-gaap_DeferredTaxAssetsGross	455.8us-gaap_DeferredTaxAssetsGross
Valuation allowance	(271.3)	(232.6)
Net deferred tax assets	290.2us-gaap_DeferredTaxAssetsNet	223.2us-gaap_DeferredTaxAssetsNet
Property and equipment	(314.2)	(453.6)
Intercompany transfers of property	(23.0)	(29.2)
Deferred costs	(20.2)	(11.4)
Other	(14.1)us-gaap_DeferredTaxLiabilitiesOther	(24.0)us-gaap_DeferredTaxLiabilitiesOther
Total deferred tax liabilities	(371.5)us-gaap_DeferredTaxLiabilities	(518.2)us-gaap_DeferredTaxLiabilities
Net deferred tax liability	(81.3)us-gaap_DeferredTaxAssetsLiabilitiesNet	(295.0)us-gaap_DeferredTaxAssetsLiabilitiesNet
Net current deferred tax asset	41.4	20.9
Net noncurrent deferred tax liability	$ (122.7)esv_NoncurrentDeferredTaxLiabilities	$ (315.9)esv_NoncurrentDeferredTaxLiabilities

Deferred Tax Assets (Liabilities), Net of Valuation Allowance, Current

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Deferred Tax Assets Premium On Long Term Debt

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Deferred tax liability intercompany property transfers.

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Noncurrent deferred tax liabilities

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from deferred income.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.

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-Glossary Deferred Tax Asset

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Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards, net of deferred tax liability attributable to taxable temporary differences.

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Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible foreign operating loss carryforwards.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences not separately disclosed.

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The tax effect as of the balance sheet date of the amount of the estimated future tax deductions arising from employee benefit costs not otherwise specified in the taxonomy, which can only be deducted for tax purposes when actual costs are incurred, and which can only be realized if sufficient tax-basis income is generated in future periods to enable the deduction to be taken.

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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Amount of deferred tax liability attributable to taxable temporary differences net of deferred tax asset attributable to deductible temporary differences and carryforwards after valuation allowances.

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Amount of deferred tax liability attributable to taxable temporary differences from capitalized costs.

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Amount of deferred tax liability attributable to taxable temporary differences not separately disclosed.

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Amount of deferred tax liability attributable to taxable temporary differences from property, plant, and equipment.

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