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Equity and Distributions (Details) (USD $) In Millions, except Share data, unless otherwise specified |  |  | 3 Months Ended
--- | --- | --- | ---
Mar. 31, 2013 Class B units [Member] | Dec. 31, 2012 Class B units [Member] | Mar. 31, 2013 Treasury Units [Member]
Mergers [Line Items] |  |  |
Units outstanding (in units) | 4,520,431 | 4,520,431 |
Treasury Units [Abstract] |  |  |
Conversion of restricted units and similar awards to common units (in units) |  |  | 939,226
Acquisition of treasury units in connection with vesting of equity-based awards (in units) |  |  | 315,783
Total cost of treasury units |  |  | $ 17.7

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