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Fair Value of Financial Instruments (Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis) (Narrative) (Details) $ in Millions | 1 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2015 USD ($) | Sep. 30, 2015 USD ($) | Dec. 31, 2014 USD ($)
Pipeline Joint Ventures [Member] |  |  |
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items] |  |  |
Equity method investment, ownership percentage |  | 33.00% |
Equity Method Investee [Member] | Pipeline Joint Ventures [Member] |  |  |
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items] |  |  |
Equity method investment, amount of investment (in dollars) | $ 6.0 | $ 51.0 |
Number of equity method investments acquired | 2 |  |
Number of pipelines to be constructed | 2 |  |
Equity Method Investee [Member] | Pipeline Joint Ventures [Member] | Equity Contributions and/or Loan Guarantees [Member] |  |  |
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items] |  |  |
Unconsolidated affiliates, outstanding commitments (in dollars) | $ 78.0 |  |
Fair Value, Measurements, Non-Recurring [Member] | Carrying Amount [Member] |  |  |
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items] |  |  |
Cost and equity method investments, including long-term receivables from investees and contractual joint ventures, aggregate carrying value (in dollars) |  | $ 68.0 | $ 17.7
Senior Notes [Member] | 4.875% Senior Notes [Member] |  |  |
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items] |  |  |
Debt instrument, interest rate (percentage) |  | 4.875% |
Senior Notes [Member] | 4.875% Senior Notes [Member] | Fair Value, Measurements, Non-Recurring [Member] | Level 1 [Member] |  |  |
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items] |  |  |
Fair value measurements, valuation techniques |  | the estimated fair value of the Company’s 4.875% Senior Notes, based on quoted market prices in active markets, a Level 1 input |
Senior Notes [Member] | 4.875% Senior Notes [Member] | Fair Value, Measurements, Non-Recurring [Member] | Carrying Amount [Member] |  |  |
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items] |  |  |
4.875% Senior Notes (in dollars) |  | $ 400.0 | 400.0
Senior Notes [Member] | 4.875% Senior Notes [Member] | Fair Value, Measurements, Non-Recurring [Member] | Fair Value [Member] | Level 1 [Member] |  |  |
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items] |  |  |
4.875% Senior Notes (in dollars) |  | $ 332.0 | $ 375.0

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- Definition Number of investments in which the Company has invested during the period that are accounted for under the equity method. + References No definition available. + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition This element represents the aggregate cost of investments accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571 + Details
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- Definition Description of the inputs and valuation technique(s) used to measure fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Total investments in (A) an entity in which the entity has significant influence, but does not have control, (B) subsidiaries that are not required to be consolidated and are accounted for using the equity and or cost method, and (C) an entity in which the reporting entity shares control of the entity with another party or group. Includes long-term advances receivable from a party that is affiliated with the reporting entity by means of direct or indirect ownership. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions. + References No definition available. + Details
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