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

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