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Revenues, Impact of Change in Accounting Policy (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Assets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable - trade, net | $ 3,659.1 |  |  |  | $ 4,358.4 |  |  |  | $ 3,659.1 |  | $ 4,358.4 |  |  |
Prepaid and other current assets | 311.5 |  |  |  | 312.7 |  |  |  | 311.5 |  | 312.7 |  |  |
Property, plant and equipment, net | 38,737.6 |  |  |  | 35,620.4 |  |  |  | 38,737.6 |  | 35,620.4 |  | $ 33,292.5 |
Liabilities and Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other current liabilities | 404.8 |  |  |  | 418.6 |  |  |  | 404.8 |  | 418.6 |  |  |
Other long-term liabilities | 751.6 |  |  |  | 578.4 |  |  |  | 751.6 |  | 578.4 |  |  |
Partners' equity | 23,853.5 |  |  |  | 22,547.2 |  |  |  | 23,853.5 |  | 22,547.2 |  |  |
Condensed Consolidated Statement of Operations Information [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues | 9,182.3 | $ 9,585.9 | $ 8,467.5 | $ 9,298.5 | 8,426.6 | $ 6,886.9 | $ 6,607.6 | $ 7,320.4 | 36,534.2 | [1] | 29,241.5 | [2] | 23,022.3 | [2]
Costs and Expenses [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating costs and expenses |  |  |  |  |  |  |  |  | 31,397.3 |  | 25,557.5 |  | 19,643.5 |
Operating Activities [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | 1,305.2 | $ 1,334.6 | $ 687.2 | $ 911.5 | $ 797.3 | $ 621.3 | $ 666.0 | $ 771.0 | 4,238.5 |  | 2,855.6 |  | 2,553.0 |
Net effect of changes in operating accounts |  |  |  |  |  |  |  |  | 16.2 |  | 32.2 |  | (180.9) |
Investing Activities [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contributions in aid of construction costs |  |  |  |  |  |  |  |  | 0.0 |  | $ 46.1 |  | $ 41.0 |
Balances Without Adoption [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable - trade, net | 3,672.4 |  |  |  |  |  |  |  | 3,672.4 |  |  |  |  |
Prepaid and other current assets | 298.2 |  |  |  |  |  |  |  | 298.2 |  |  |  |  |
Property, plant and equipment, net | 38,639.3 |  |  |  |  |  |  |  | 38,639.3 |  |  |  |  |
Liabilities and Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other current liabilities | 404.3 |  |  |  |  |  |  |  | 404.3 |  |  |  |  |
Other long-term liabilities | 664.8 |  |  |  |  |  |  |  | 664.8 |  |  |  |  |
Partners' equity | 23,842.5 |  |  |  |  |  |  |  | 23,842.5 |  |  |  |  |
Condensed Consolidated Statement of Operations Information [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 35,901.5 |  |  |  |  |
Costs and Expenses [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating costs and expenses |  |  |  |  |  |  |  |  | 30,775.6 |  |  |  |  |
Operating Activities [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | 4,227.5 |  |  |  |  |
Net effect of changes in operating accounts |  |  |  |  |  |  |  |  | (71.1) |  |  |  |  |
Investing Activities [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contributions in aid of construction costs |  |  |  |  |  |  |  |  | 87.3 |  |  |  |  |
Impact of Adoption [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable - trade, net | (13.3) |  |  |  |  |  |  |  | (13.3) |  |  |  |  |
Prepaid and other current assets | 13.3 |  |  |  |  |  |  |  | 13.3 |  |  |  |  |
Property, plant and equipment, net | 98.3 |  |  |  |  |  |  |  | 98.3 |  |  |  |  |
Liabilities and Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other current liabilities | 0.5 |  |  |  |  |  |  |  | 0.5 |  |  |  |  |
Other long-term liabilities | 86.8 |  |  |  |  |  |  |  | 86.8 |  |  |  |  |
Partners' equity | $ 11.0 |  |  |  |  |  |  |  | 11.0 |  |  |  |  |
Condensed Consolidated Statement of Operations Information [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 632.7 |  |  |  |  |
Costs and Expenses [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating costs and expenses |  |  |  |  |  |  |  |  | 621.7 |  |  |  |  |
Operating Activities [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | 11.0 |  |  |  |  |
Net effect of changes in operating accounts |  |  |  |  |  |  |  |  | 87.3 |  |  |  |  |
Investing Activities [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contributions in aid of construction costs |  |  |  |  |  |  |  |  | (87.3) |  |  |  |  |
Impact of Adoption [Member] | ASC 606 [Member] | Equity NGL Revenue [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Consolidated Statement of Operations Information [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 621.7 |  |  |  |  |
Impact of Adoption [Member] | ASC 606 [Member] | CIAC Revenue [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Consolidated Statement of Operations Information [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 11.0 |  |  |  |  |
[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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