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General Accounting Matters (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2013 | Mar. 31, 2012 | Dec. 31, 2012
Income Tax Expense (Benefit) [Abstract] |  |  |  |  |
Benefit from (provision for) income taxes | $ (6.4) |  | $ 34.4 |  |
Income tax benefit from the conversion of company structure |  |  | 46.5 |  |
Cash payments for federal and state income taxes |  |  | 22 |  |
Other Nonoperating Income (Expense) [Abstract] |  |  |  |  |
Gain on sales of available-for-sale securities of Energy Transfer Equity | 0 | [1] | 53.3 | [1] |
Distribution income from Energy Transfer Equity | 0 |  | 4.1 |  |
Other | (0.3) |  | 1.0 |  |
Total | (0.3) |  | 58.4 |  |
Restricted cash [Abstract] |  |  |  |  |
Restricted cash | 68.1 |  |  |  | 4.3
Allowance for Doubtful Accounts, Current [Member] |  |  |  |  |
Movement in valuation allowances and reserves [Roll Forward] |  |  |  |  |
Balance at beginning of period | 13.2 |  | 13.4 |  |
Charged to costs and expenses | 0 |  | 0.1 |  |
Deductions | (1.3) |  | (0.5) |  |
Balance at end of period | $ 11.9 |  | $ 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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