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Revenues, Impact of Change in Accounting Policy (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Assets [Abstract] |  |  |  |  |  |  |  |  |
Accounts receivable - trade, net | $ 4,222.9 |  |  |  | $ 4,222.9 |  |  |  | $ 4,358.4
Prepaid and other current assets | 609.9 |  |  |  | 609.9 |  |  |  | 312.7
Property, plant and equipment, net | 37,802.9 |  |  |  | 37,802.9 |  |  |  | 35,620.4
Other assets | 260.6 |  |  |  | 260.6 |  |  |  | 196.4
Liabilities and Equity |  |  |  |  |  |  |  |  |
Other long-term liabilities | 747.2 |  |  |  | 747.2 |  |  |  | 578.4
Partners' equity | 23,073.1 |  |  |  | 23,073.1 |  |  |  | $ 22,547.2
Condensed Consolidated Statement of Operations Information [Abstract] |  |  |  |  |  |  |  |  |
Revenues | 9,585.9 | [1] | $ 6,886.9 | [2] | 27,351.9 | [1] | $ 20,814.9 | [2] |
Costs and Expenses [Abstract] |  |  |  |  |  |  |  |  |
Operating costs and expenses | 8,001.9 |  | 6,079.8 |  | 23,776.6 |  | 18,143.2 |  |
Operating Activities [Abstract] |  |  |  |  |  |  |  |  |
Net income | 1,334.6 |  | $ 621.3 |  | 2,933.3 |  | 2,058.3 |  |
Net effect of changes in operating accounts |  |  |  |  | (261.9) |  | (512.1) |  |
Investing Activities [Abstract] |  |  |  |  |  |  |  |  |
Contributions in aid of construction costs |  |  |  |  | 0.0 |  | $ 36.2 |  |
Balances Without Adoption [Member] | ASC 606 [Member] |  |  |  |  |  |  |  |  |
Assets [Abstract] |  |  |  |  |  |  |  |  |
Accounts receivable - trade, net | 4,411.5 |  |  |  | 4,411.5 |  |  |  |
Prepaid and other current assets | 421.3 |  |  |  | 421.3 |  |  |  |
Property, plant and equipment, net | 37,727.7 |  |  |  | 37,727.7 |  |  |  |
Other assets | 260.6 |  |  |  | 260.6 |  |  |  |
Liabilities and Equity |  |  |  |  |  |  |  |  |
Other long-term liabilities | 679.3 |  |  |  | 679.3 |  |  |  |
Partners' equity | 23,065.8 |  |  |  | 23,065.8 |  |  |  |
Condensed Consolidated Statement of Operations Information [Abstract] |  |  |  |  |  |  |  |  |
Revenues | 9,367.6 |  |  |  | 26,853.2 |  |  |  |
Costs and Expenses [Abstract] |  |  |  |  |  |  |  |  |
Operating costs and expenses | 7,786.1 |  |  |  | 23,285.2 |  |  |  |
Operating Activities [Abstract] |  |  |  |  |  |  |  |  |
Net income |  |  |  |  | 2,926.0 |  |  |  |
Net effect of changes in operating accounts |  |  |  |  | (329.8) |  |  |  |
Investing Activities [Abstract] |  |  |  |  |  |  |  |  |
Contributions in aid of construction costs |  |  |  |  | 67.9 |  |  |  |
Impact of Adoption [Member] | ASC 606 [Member] |  |  |  |  |  |  |  |  |
Assets [Abstract] |  |  |  |  |  |  |  |  |
Accounts receivable - trade, net | (188.6) |  |  |  | (188.6) |  |  |  |
Prepaid and other current assets | 188.6 |  |  |  | 188.6 |  |  |  |
Property, plant and equipment, net | 75.2 |  |  |  | 75.2 |  |  |  |
Other assets | 0.0 |  |  |  | 0.0 |  |  |  |
Liabilities and Equity |  |  |  |  |  |  |  |  |
Other long-term liabilities | 67.9 |  |  |  | 67.9 |  |  |  |
Partners' equity | 7.3 |  |  |  | 7.3 |  |  |  |
Condensed Consolidated Statement of Operations Information [Abstract] |  |  |  |  |  |  |  |  |
Revenues | 218.3 |  |  |  | 498.7 |  |  |  |
Costs and Expenses [Abstract] |  |  |  |  |  |  |  |  |
Operating costs and expenses | 215.8 |  |  |  | 491.4 |  |  |  |
Operating Activities [Abstract] |  |  |  |  |  |  |  |  |
Net income |  |  |  |  | 7.3 |  |  |  |
Net effect of changes in operating accounts |  |  |  |  | 67.9 |  |  |  |
Investing Activities [Abstract] |  |  |  |  |  |  |  |  |
Contributions in aid of construction costs |  |  |  |  | (67.9) |  |  |  |
Impact of Adoption [Member] | ASC 606 [Member] | Equity NGL Revenue [Member] |  |  |  |  |  |  |  |  |
Condensed Consolidated Statement of Operations Information [Abstract] |  |  |  |  |  |  |  |  |
Revenues | 215.8 |  |  |  | 491.4 |  |  |  |
Impact of Adoption [Member] | ASC 606 [Member] | CIAC Revenue [Member] |  |  |  |  |  |  |  |  |
Condensed Consolidated Statement of Operations Information [Abstract] |  |  |  |  |  |  |  |  |
Revenues | $ 2.5 |  |  |  | $ 7.3 |  |  |  |
[1] | Revenues are accounted for under ASC 606 upon implementation at January 1, 2018.
[2] | Revenues are accounted for under ASC 605 for historical periods prior to January 1, 2018.

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