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General Accounting Matters (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Mar. 31, 2012 | Sep. 30, 2013 | Sep. 30, 2012 | Dec. 31, 2012
Income Tax Expense (Benefit) [Abstract] |  |  |  |  |  |  |  |  |  |
Provision for (benefit from) income taxes | $ 19.4 |  | $ 2.4 |  |  | $ 46.2 |  | $ (23.5) |  |
Income tax expense due to changes in Texas Margin Tax |  |  |  |  |  | 19.6 |  |  |  |
Income tax benefit from the conversion of company structure |  |  |  |  | 46.5 |  |  |  |  |
Deferred Income Tax Expense (Benefit) |  |  |  |  |  | 32.1 |  | (67.9) |  |
Current Income Tax Expense |  |  |  |  |  | 14.1 |  |  |  |
Cash payments for income taxes |  |  |  |  |  |  |  | 22.0 |  |
Other Nonoperating Income (Expense) [Abstract] |  |  |  |  |  |  |  |  |  |
Gain on sales of available-for-sale securities of Energy Transfer Equity | 0 | [1] | 0 | [1] |  | 0 | [1] | 68.8 | [1] |
Distribution income from Energy Transfer Equity | 0 |  | 0 |  |  | 0 |  | 4.1 |  |
Other | 0.4 |  | 1.2 |  |  | (0.5) |  | (0.2) |  |
Total | 0.4 |  | 1.2 |  |  | (0.5) |  | 72.7 |  |
Restricted cash [Abstract] |  |  |  |  |  |  |  |  |  |
Restricted cash | 35.9 |  |  |  |  | 35.9 |  |  |  | 4.3
Allowance for Doubtful Accounts, Current [Member] |  |  |  |  |  |  |  |  |  |
Movement in valuation allowances and reserves [Roll Forward] |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  |  |  |  | 13.4 | 13.2 |  | 13.4 |  |
Charged to costs and expenses |  |  |  |  |  | 1.2 |  | 0.2 |  |
Deductions |  |  |  |  |  | (7.7) |  | (0.4) |  |
Balance at end of period | $ 6.7 |  | $ 13.2 |  |  | $ 6.7 |  | $ 13.2 |  |
[1] | See Note 7 for information regarding the liquidation of our investment in limited partnership units of Energy Transfer Equity.

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