Supplemental Financial Information (Other Current Assets) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Supplemental Financial Information [Abstract]
Inventory	$ 240.3us-gaap_InventoryNet	$ 256.4us-gaap_InventoryNet
Prepaid taxes	90.6us-gaap_PrepaidTaxes	88.1us-gaap_PrepaidTaxes
Deferred mobilization costs	61.9us-gaap_OtherDeferredCostsNet	47.4us-gaap_OtherDeferredCostsNet
Prepaid expenses	33.8us-gaap_OtherPrepaidExpenseCurrent	18.5us-gaap_OtherPrepaidExpenseCurrent
Derivative assets	0.6us-gaap_DerivativeAssetsCurrent	11.6us-gaap_DerivativeAssetsCurrent
Deferred tax assets	43.8us-gaap_DeferredTaxAssetsNetCurrent	23.1us-gaap_DeferredTaxAssetsNetCurrent
Assets held for sale	152.4	8.6
Other	6.0esv_AssetsCurrentOther	10.2esv_AssetsCurrentOther
Other current assets	$ 629.4us-gaap_OtherAssetsCurrent	$ 463.9us-gaap_OtherAssetsCurrent

Assets Current Other

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Amount classified as assets attributable to disposal group held for sale or disposed of, expected to be disposed of within one year or the normal operating cycle, if longer.

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Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards expected to be realized or consumed within one year or operating cycle, if longer.

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Fair value, after the effects of master netting arrangements, of a financial asset or other 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, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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

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Net amount of other deferred costs capitalized at the end of the reporting period. Does not include deferred finance costs or deferred acquisition costs of insurance companies.

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Amount of asset related to consideration paid in advance for other costs that provide economic benefits within a future period of one year or the normal operating cycle, if longer.

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Amount of asset related to consideration paid in advance for income and other taxes that provide economic benefits within a future period of one year or the normal operating cycle, if longer.

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