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Revenues, Impact of Change in Accounting Policy (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Assets [Abstract] |  |  |  |  |
Accounts receivable - trade, net | $ 4,439.9 |  |  |  | $ 4,358.4
Prepaid and other current assets | 353.3 |  |  |  | 312.7
Property, plant and equipment, net | 36,416.3 |  |  |  | 35,620.4
Other assets | 210.0 |  |  |  | 196.4
Liabilities and Equity |  |  |  |  |
Other long-term liabilities | 603.4 |  |  |  | 578.4
Partners' equity | 22,753.3 |  |  |  | $ 22,547.2
Condensed Consolidated Statement of Operations Information [Abstract] |  |  |  |  |
Revenues | 9,298.5 | [1] | $ 7,320.4 | [2] |
Costs and Expenses [Abstract] |  |  |  |  |
Operating costs and expenses | 8,222.7 |  | 6,333.2 |  |
Operating Activities [Abstract] |  |  |  |  |
Net income | 911.5 |  | 771.0 |  |
Net effect of changes in operating accounts | (203.1) |  | (288.8) |  |
Investing Activities [Abstract] |  |  |  |  |
Contributions in aid of construction costs | 0.0 |  | $ 15.6 |  |
Balances Without Adoption [Member] | ASC 606 [Member] |  |  |  |  |
Assets [Abstract] |  |  |  |  |
Accounts receivable - trade, net | 4,504.5 |  |  |  |
Prepaid and other current assets | 288.9 |  |  |  |
Property, plant and equipment, net | 36,410.9 |  |  |  |
Other assets | 209.8 |  |  |  |
Liabilities and Equity |  |  |  |  |
Other long-term liabilities | 601.2 |  |  |  |
Partners' equity | 22,750.1 |  |  |  |
Condensed Consolidated Statement of Operations Information [Abstract] |  |  |  |  |
Revenues | 9,181.5 |  |  |  |
Costs and Expenses [Abstract] |  |  |  |  |
Operating costs and expenses | 8,108.9 |  |  |  |
Operating Activities [Abstract] |  |  |  |  |
Net income | 908.3 |  |  |  |
Net effect of changes in operating accounts | (205.3) |  |  |  |
Investing Activities [Abstract] |  |  |  |  |
Contributions in aid of construction costs | 5.4 |  |  |  |
Impact of Adoption [Member] | ASC 606 [Member] |  |  |  |  |
Assets [Abstract] |  |  |  |  |
Accounts receivable - trade, net | (64.6) |  |  |  |
Prepaid and other current assets | 64.4 |  |  |  |
Property, plant and equipment, net | 5.4 |  |  |  |
Other assets | 0.2 |  |  |  |
Liabilities and Equity |  |  |  |  |
Other long-term liabilities | 2.2 |  |  |  |
Partners' equity | 3.2 |  |  |  |
Condensed Consolidated Statement of Operations Information [Abstract] |  |  |  |  |
Revenues | 117.0 |  |  |  |
Costs and Expenses [Abstract] |  |  |  |  |
Operating costs and expenses | 113.8 |  |  |  |
Operating Activities [Abstract] |  |  |  |  |
Net income | 3.2 |  |  |  |
Net effect of changes in operating accounts | 2.2 |  |  |  |
Investing Activities [Abstract] |  |  |  |  |
Contributions in aid of construction costs | $ (5.4) |  |  |  |
[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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