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Summary of Significant Accounting Policies (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Current assets and current liabilities [Abstract] |  |  |  |  |  |
Threshold for components of total current assets and liabilities to be presented as an individual caption on Consolidated Balance Sheet (in hundredths) | 5.00% |  |  |  |  |
Deferred revenues [Abstract] |  |  |  |  |  |
Deferred revenues | $ 82.1 |  | $ 109.1 |  |  |
Environmental costs [Abstract] |  |  |  |  |  |
Environmental reserves - current portion | 6.5 |  | 4.5 |  |  |
Other Nonoperating Income (Expense) [Abstract] |  |  |  |  |  |
Gain on sales of available-for-sale equity securities of Energy Transfer Equity | 68.8 | [1] | 0 | [1] | 0 | [1]
Distribution income from Energy Transfer Equity | 4.1 |  | 0 |  | 0 |
Other | (0.3) |  | (0.6) |  | 2.7 |
Total | 72.6 |  | (0.6) |  | 2.7 |
Restricted cash [Abstract] |  |  |  |  |  |
Restricted cash | 4.3 |  | 38.5 |  |  |
Allowance for Doubtful Accounts, Current [Member] |  |  |  |  |  |
Movement in valuation allowances and reserves [Roll Forward] |  |  |  |  |  |
Balance at beginning of period | 13.4 |  | 18.4 |  | 16.8 |
Charged to costs and expenses | 0.3 |  | 0.8 |  | 2.6 |
Acquisition-related additions and other | 0 |  | 0 |  | 1.1 |
Deductions | (0.5) | [2] | (5.8) | [2] | (2.1) | [2]
Balance at end of period | 13.2 |  | 13.4 |  | 18.4 |
Reserve for Environmental Costs [Member] |  |  |  |  |  |
Movement in valuation allowances and reserves [Roll Forward] |  |  |  |  |  |
Balance at beginning of period | 12.3 |  | 12.4 |  | 16.7 |
Charged to costs and expenses | 13.9 |  | 9.3 |  | 2.8 |
Acquisition-related additions and other | 5.2 |  | 1.0 |  | 0.9 |
Deductions | (17.7) |  | (10.4) |  | (8.0) |
Balance at end of period | $ 13.7 |  | $ 12.3 |  | $ 12.4 |
[1] | See Note 9 for information regarding the liquidation of our investment in limited partnership units of Energy Transfer Equity.
[2] | The 2011 deduction amount is primarily due to our reassessment of the allowance for doubtful accounts as a result of improved credit ratings of a customer, which reduced our exposure to potential uncollectibility.

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