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General Accounting Matters (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Mar. 31, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | Dec. 31, 2012
Income Tax Expense (Benefit) [Abstract] |  |  |  |  |  |  |  |  |  |
Provision for (benefit from) income taxes | $ 20.4 |  | $ 8.5 |  |  | $ 26.8 |  | $ (25.9) |  |
Increase (decrease) in provision for income taxes compared to prior period | 11.9 |  |  |  |  | 52.7 |  |  |  |
Deferred income tax expense due to changes in Texas Margin Tax | 20.3 |  |  |  |  |  |  |  |  |
Current income tax benefit due to changes in Texas Margin Tax | (7.2) |  |  |  |  |  |  |  |  |
Income tax expense due to changes in Texas Margin Tax | 13.1 |  |  |  |  | 13.1 |  |  |  |
Income tax benefit from the conversion of company structure |  |  |  |  | 46.5 |  |  |  |  |
Cash payments for federal and state income taxes |  |  |  |  |  | 22.0 |  |  |  |
Other Nonoperating Income (Expense) [Abstract] |  |  |  |  |  |  |  |  |  |
Gain on sales of available-for-sale securities of Energy Transfer Equity | 0 | [1] | 15.5 | [1] |  | 0 | [1] | 68.8 | [1] |
Distribution income from Energy Transfer Equity | 0 |  | 0 |  |  | 0 |  | 4.1 |  |
Other | (0.6) |  | (2.4) |  |  | (0.9) |  | (1.4) |  |
Total | (0.6) |  | 13.1 |  |  | (0.9) |  | 71.5 |  |
Restricted cash [Abstract] |  |  |  |  |  |  |  |  |  |
Restricted cash | 26.3 |  |  |  |  | 26.3 |  |  |  | 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 |  |  |  |  |  | 0.4 |  | 0 |  |
Deductions |  |  |  |  |  | (1.4) |  | (0.4) |  |
Balance at end of period | $ 12.2 |  | $ 13.0 |  |  | $ 12.2 |  | $ 13.0 |  |
[1] | See Note 7 for information regarding the liquidation of our investment in limited partnership units of Energy Transfer Equity.

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