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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, 2013 | Dec. 31, 2012 | Dec. 31, 2011
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 | $ 108.7 |  | $ 82.1 |  |  |
Environmental Costs [Abstract] |  |  |  |  |  |
Environmental reserves - current portion | 6.0 |  | 6.5 |  |  |
Impairment Testing for Unconsolidated Affiliates [Abstract] |  |  |  |  |  |
Non-cash impairment charges | 4.8 |  | 0 |  | 0 |
Other Non-operating Income [Abstract] |  |  |  |  |  |
Gain on sales of available-for-sale securities of Energy Transfer Equity (1) | 0 | [1] | 68.8 | [1] | 0 | [1]
Distribution income from Energy Transfer Equity | 0 |  | 4.1 |  | 0 |
Other | (1.1) |  | (0.3) |  | (0.6) |
Total | (1.1) |  | 72.6 |  | (0.6) |
Restricted Cash [Abstract] |  |  |  |  |  |
Restricted cash | 65.6 |  | 4.3 |  |  |
Minor Investment [Member] | Maximum [Member] |  |  |  |  |  |
Consolidation Policy [Abstract] |  |  |  |  |  |
Equity method of ownership interest (in hundredths) | 50.00% |  |  |  |  |
Minor Investment [Member] | Minimum [Member] |  |  |  |  |  |
Consolidation Policy [Abstract] |  |  |  |  |  |
Equity method of ownership interest (in hundredths) | 20.00% |  |  |  |  |
Major Investment [Member] | Maximum [Member] |  |  |  |  |  |
Consolidation Policy [Abstract] |  |  |  |  |  |
Equity method of ownership interest (in hundredths) | 50.00% |  |  |  |  |
Major Investment [Member] | Minimum [Member] |  |  |  |  |  |
Consolidation Policy [Abstract] |  |  |  |  |  |
Equity method of ownership interest (in hundredths) | 3.00% |  |  |  |  |
Allowance for Doubtful Accounts, Current [Member] |  |  |  |  |  |
Movement in valuation allowances and reserves [Roll Forward] |  |  |  |  |  |
Balance at beginning of period | 13.2 |  | 13.4 |  | 18.4 |
Charged to costs and expenses | 2.1 |  | 0.3 |  | 0.8 |
Deductions | (7.8) | [2] | (0.5) | [2] | (5.8) | [2]
Balance at end of period | 7.5 |  | 13.2 |  | 13.4 |
Reserve for Environmental Costs [Member] |  |  |  |  |  |
Movement in valuation allowances and reserves [Roll Forward] |  |  |  |  |  |
Balance at beginning of period | 13.7 |  | 12.3 |  | 12.4 |
Charged to costs and expenses | 3.9 |  | 13.9 |  | 9.3 |
Acquisition-related additions and other | 0.7 |  | 5.2 |  | 1.0 |
Deductions | (8.4) |  | (17.7) |  | (10.4) |
Balance at end of period | $ 9.9 |  | $ 13.7 |  | $ 12.3 |
[1] | See Note 9 for information regarding the liquidation of our investment in limited partnership units of Energy Transfer Equity.
[2] | The 2013 deduction is primarily due to the write-off of certain amounts attributable to companies in bankruptcy and amounts we believe are no longer collectible. 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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