| **Commitments and Contingencies Additional information (Details) (USD $)In Millions, unless otherwise specified** | Jun. 30, 2013 | Dec. 31, 2012 |
|-------------------------------------------------------------------------------------------------------------------|---------------|---------------|
| **Commitments and Contingencies Disclosure [Abstract]**                                                           |          |          |
| Accrued Environmental Liabilities                                                                                 | $ 4.9         | $ 8.4         |
| Maximum Annual Repurchase Obligation                                                                              | $ 4.1         |          |

| X                                                                                                                                                                                                                                                                         |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Maximum Annual Partnership Unit Repurchase Obligation
+ References
No definition available.
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Carrying value of the obligation (known or estimated) arising from requirements to perform activities to remediate one or more sites, payable in twelve months or in the next operating cycle if longer.
+ References
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| X                                                                                                                                                                                 |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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