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Supplemental Financial Information (Other Current Assets) (Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Supplemental Financial Information [Abstract] |  |
Inventory | $ 250.4 us-gaap_InventoryGross | $ 240.3 us-gaap_InventoryGross
Disposal Group, Including Discontinued Operation, Assets, Current | 152.8 us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent | 152.4 us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent
Prepaid taxes | 89.0 us-gaap_PrepaidTaxes | 90.6 us-gaap_PrepaidTaxes
Deferred costs | 60.7 us-gaap_OtherDeferredCostsNet | 61.9 us-gaap_OtherDeferredCostsNet
Prepaid expenses | 21.0 us-gaap_PrepaidExpenseCurrent | 33.8 us-gaap_PrepaidExpenseCurrent
Deferred tax assets | 43.8 us-gaap_DeferredTaxAssetsGrossCurrent | 43.8 us-gaap_DeferredTaxAssetsGrossCurrent
Other | 7.6 esv_AssetsCurrentOther | 6.6 esv_AssetsCurrentOther
Other current assets | $ 625.3 us-gaap_OtherAssetsCurrent | $ 629.4 us-gaap_OtherAssetsCurrent

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=51716988&loc=d3e1107-107759 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=51716988&loc=SL51721533-107759 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=51719941&loc=d3e2941-110230 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 5B -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=51717284&loc=SL51721673-107760 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=51824106&loc=d3e2473-110228 + Details
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