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Derivative Instruments, Hedging Activities and Fair Value Measurements, Gains and Losses on Derivative Instruments and Related Hedged Items (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Unrealized mark-to-market gains (losses) |  | $ (140.5) |
NGL Pipelines & Services [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Unrealized mark-to-market gains (losses) |  | (3.5) |
Crude Oil Pipelines & Services [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Unrealized mark-to-market gains (losses) |  | (129.6) |
Natural Gas Pipelines & Services [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Unrealized mark-to-market gains (losses) |  | (5.8) |
Petrochemical & Refined Products Services [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Unrealized mark-to-market gains (losses) |  | (1.6) |
Derivatives in fair value hedging relationships [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gain (Loss) Recognized in Income on Derivative |  | 0.5 | $ 17.9
Gain (Loss) Recognized in Income on Hedged Item |  | 2.3 | (11.5)
Gain (Loss) on Fair Value Hedges Recognized in Earnings |  | 2.8 | 6.4
Unrealized mark-to-market gains (losses) |  | (7.2) |
Derivatives in fair value hedging relationships [Member] | Interest rate derivatives [Member] | Interest expense [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gain (Loss) Recognized in Income on Derivative |  | 0.7 | (0.9)
Gain (Loss) Recognized in Income on Hedged Item |  | (0.8) | 0.9
Derivatives in fair value hedging relationships [Member] | Commodity derivatives [Member] | Revenue [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gain (Loss) Recognized in Income on Derivative |  | (0.2) | 18.8
Gain (Loss) Recognized in Income on Hedged Item |  | 3.1 | (12.4)
Derivatives in cash flow hedging relationships [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Change in Value Recognized in Other Comprehensive Income (Loss) on Derivative |  | 14.5 | 147.2
Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) to Income |  | 4.0 | (16.7)
Derivatives in cash flow hedging relationships [Member] | Interest rate derivatives [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Change in Value Recognized in Other Comprehensive Income (Loss) on Derivative |  | 11.1 | 2.4
Accumulated other comprehensive loss related to interest rate derivative instruments expected to be reclassified to earnings in interest expense over the next twelve months |  | (37.2) |
Derivatives in cash flow hedging relationships [Member] | Interest rate derivatives [Member] | Interest expense [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) to Income |  | (10.5) | (9.6)
Derivatives in cash flow hedging relationships [Member] | Commodity derivatives [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Net accumulated other comprehensive income (loss) related to commodity derivative instruments expected to be reclassified to earnings over the next twelve months |  | (21.3) |
Accumulated other comprehensive income (loss) related to commodity derivative instruments expected to be reclassified to revenue over the next twelve months |  | (20.8) |
Accumulated other comprehensive income (loss) related to commodity derivative instruments expected to be reclassified to operating costs and expenses over the next twelve months |  | (0.5) |
Derivatives in cash flow hedging relationships [Member] | Commodity derivatives [Member] | Revenue [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Change in Value Recognized in Other Comprehensive Income (Loss) on Derivative | [1] | 3.0 | 147.6
Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) to Income |  | 14.0 | (7.5)
Derivatives in cash flow hedging relationships [Member] | Commodity derivatives [Member] | Operating costs and expenses [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Change in Value Recognized in Other Comprehensive Income (Loss) on Derivative | [1] | 0.4 | (2.8)
Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) to Income |  | 0.5 | 0.4
Derivatives not designated as hedging instruments [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gain (Loss) Recognized in Income on Derivative |  | (155.0) | 20.2
Realized mark-to-market gains (losses) |  | (21.7) |
Derivatives not designated as hedging instruments [Member] | Commodity derivatives [Member] | Revenue [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gain (Loss) Recognized in Income on Derivative |  | (153.5) | 15.7
Derivatives not designated as hedging instruments [Member] | Commodity derivatives [Member] | Operating costs and expenses [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gain (Loss) Recognized in Income on Derivative |  | $ (1.5) | $ 4.5
[1] | The fair value of these derivative instruments will be reclassified to their respective locations on the Unaudited Condensed Statement of Consolidated Operations upon settlement of the underlying derivative transactions, as appropriate.

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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 + Details
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- Definition The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4D -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624177-113959 + Details
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- Definition The estimated net amount of unrealized gains or losses on interest rate cash flow hedges as of the balance sheet date expected to be reclassified to earnings within the next twelve months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80748-113994 + Details
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