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Employee Benefits, Defined Benefit Plans (Details) (USD $) In Millions, unless otherwise specified | 6 Months Ended |  | 6 Months Ended |  | 6 Months Ended | 3 Months Ended |  | 6 Months Ended
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Jun. 30, 2013 VEBAs | Jun. 30, 2013 VEBAs Maximum | Jun. 30, 2013 Union VEBA trustrees | Jun. 30, 2013 Union VEBA Company Appointed trustrees | Jun. 30, 2013 Salaried VEBA | Mar. 31, 2013 Variable cash contribution VEBAs | Jun. 30, 2013 Variable cash contribution VEBAs Maximum | Jun. 30, 2013 Variable cash contribution VEBAs Annual Cash Flows up to $20 Million | Jun. 30, 2013 Variable cash contribution VEBAs Annual Cash Flows in Excess of $20 Million
VEBA Postretirement Medical Obligations |  |  |  |  |  |  |  |  |
Number of trustees |  |  | 4 | 2 |  |  |  |  |
Administrative expenses of the VEBAs |  | $ 0.3 |  |  |  |  |  |  |
Postretirement medical plan contribution obligation percentage |  |  |  |  |  |  |  | 10.00% | 20.00%
Cash flow in determining VEBA obligation | 20.0 |  |  |  |  |  |  |  |
Variable cash contribution obligation to VEBAs |  |  |  |  |  |  | 20.0 |  |
Percent allocation of total contribution between VEBAs |  |  | 85.50% |  | 14.50% |  |  |  |
Annual VEBA contribution paid |  |  |  |  |  | $ 20.0 |  |  |

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- Definition Administrative Expense Obligation + References No definition available. + Details
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- Definition Annual VEBA contribution paid + References No definition available. + Details
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- Definition Cash flow in determining VEBA obligation + References No definition available. + Details
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- Definition Number of Trustees. + References No definition available. + Details
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- Definition Percent allocation of total contribution between VEBAs + References No definition available. + Details
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- Definition Postretirement medical plan contribution obligation. + References No definition available. + Details
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- Definition Postretirement Medical Plan Contribution Obligation Percentage. + References No definition available. + Details
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- Details
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