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Supplemental Financial Information (Other Assets, Net) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Supplemental Financial Information [Abstract]
Intangible assets	$ 49.0us-gaap_FiniteLivedIntangibleAssetsNet	$ 83.8us-gaap_FiniteLivedIntangibleAssetsNet
Unbilled reimbursable receivables	18.6us-gaap_AccountsReceivableNetNoncurrent	51.9us-gaap_AccountsReceivableNetNoncurrent
Prepaid taxes on intercompany transfers of property	39.7us-gaap_PrepaidExpenseOtherNoncurrent	50.2us-gaap_PrepaidExpenseOtherNoncurrent
Supplemental executive retirement plan assets	43.2us-gaap_AssetsHeldInTrustNoncurrent	37.7us-gaap_AssetsHeldInTrustNoncurrent
Contracts Receivable, Claims and Uncertain Amounts	30.6us-gaap_ContractsReceivableClaimsAndUncertainAmounts	30.6us-gaap_ContractsReceivableClaimsAndUncertainAmounts
Deferred mobilization costs	82.3us-gaap_DeferredCosts	59.1us-gaap_DeferredCosts
Deferred tax assets	38.4us-gaap_DeferredTaxAssetsNetNoncurrent	25.2us-gaap_DeferredTaxAssetsNetNoncurrent
Other	12.4esv_AssetsNoncurrentOther	14.2esv_AssetsNoncurrentOther
Other assets, net	$ 314.2us-gaap_OtherAssetsNoncurrent	$ 352.7us-gaap_OtherAssetsNoncurrent

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Assets Noncurrent Other

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Amount due from customers or clients, more than one year from the balance sheet date, for goods or services that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.

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The amount of cash, securities, or other assets held by a third-party trustee pursuant to the terms of an agreement which assets are available to be used by beneficiaries to that agreement only within the specific terms thereof and which agreement is expected to terminate more than one year from the balance sheet date (or operating cycle, if longer) at which time the assets held-in-trust will be released or forfeited.

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Amount of billed or unbilled claims or other similar items subject to uncertainty concerning their determination or ultimate realization under long-term contracts.

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Sum of the carrying amounts of deferred costs that are expected to be recognized as a charge against earnings in periods after one year or beyond the normal operating cycle, if longer.

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Amount after allocation of valuation allowances of noncurrent deferred tax asset attributable to deductible temporary differences and carryforwards. Noncurrent assets are expected to be realized or consumed after one year (or the normal operating cycle, if longer).

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Aggregate carrying amount, as of the balance sheet date, of noncurrent assets not separately disclosed in the balance sheet. Noncurrent assets are expected to be realized or consumed after one year (or the normal operating cycle, if longer).

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Carrying amount as of the balance sheet date of amounts paid in advance which will be charged against earnings in periods after one year or beyond the operating cycle, if longer.

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