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Contingencies (Details) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Nov. 30, 2012 company | Sep. 30, 2014 USD ($) company | Sep. 30, 2015 USD ($) | Dec. 31, 1992 defendant
Environmental litigation with respect to Lowry Landfill site |  |  |  |
Contingencies |  |  |  |
Approximate number of other companies named in a lawsuit with respect to Lowry Landfill | defendant |  |  |  | 38
Waste Management litigation |  |  |  |
Contingencies |  |  |  |
Response cost related to site, minimum before the company may be asked to make payments |  |  | $ 319 |
Period before projected completion of project when response cost is expected to exceed minimum amount |  |  | 3 years |
Estimated additional cleanup costs |  |  | $ 10 |
Estimated additional site costs for the potentially responsible party (PRP) group |  |  | 1 |
Environmental litigation with respect to Lower Duwamish site |  |  |  |
Contingencies |  |  |  |
Number of additional potentially responsible parties (PRPs) | company |  | 20 |  |
Expected future remediation costs |  |  | $ 342 |
Site cleanup costs |  | $ 100 |  |
Number of companies whose data is under review | company | 30 |  |  |
Period over which data is reviewed | 2 years |  |  |
Environmental litigation with respect to Lower Duwamish site | Minimum |  |  |  |
Contingencies |  |  |  |
Number of potentially responsible parties (PRPs) | company | 50 |  |  |
Number of potentially responsible parties (PRP) groups whose data is under review | company | 2 |  |  |

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- Definition Represents the minimum amount of response cost related to the site above which the entity might be called upon by the counterparties to make additional payments. + References No definition available. + Details
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