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Investment in Unconsolidated Affiliate and Related Party Transactions Summarized Balance Sheet Information of Equity Method Investment (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Summarized Financial Information of Equity Method Investment [Line Items] |  |
Current assets | $ 438.0 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentAssets | $ 549.0 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentAssets
Non-current assets | 11,399.0 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNoncurrentAssets | 10,683.0 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNoncurrentAssets
Current liabilities | 671.0 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentLiabilities | 720.0 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentLiabilities
Non-current liabilities | $ 2,344.0 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNoncurrentLiabilities | $ 2,331.0 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNoncurrentLiabilities

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- Definition The amount of current assets reported by an equity method investment of the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(g)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33912-111571 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 28 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14064-108612 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph bb -Article 1 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph g -Subparagraph 1, 2 -Article 4 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph w -Article 1 + Details
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