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Employee Benefits Plans (Details 11) | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Other Postretirement benefit expense U.S. |  |  |
Weighted-average discount rates used in determining annual postretirement benefit expense |  |  |
Discount rate | 4.15% | 5.00% | 4.10%
Other Postretirement benefit expense Foreign |  |  |
Weighted-average discount rates used in determining annual postretirement benefit expense |  |  |
Discount rate | 4.00% | 4.80% | 4.00%

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