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Other Retirement Plans | 3 Months Ended
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Mar. 31, 2013
Multiemployer Plans [Abstract] |
Other Retirement Plans | Other Retirement Plans Multi-Employer Pension Plans. Certain of MasTec’s subsidiaries contribute amounts to multi-employer pension and other multi-employer benefit plans and trusts. Multi-employer plan contribution rates are determined annually and assessed on a “pay-as-you-go” basis based on union employee payrolls. Union payrolls cannot be determined for future periods because the number of union employees employed at any given time, and the plans in which they may participate, vary depending upon the location and number of ongoing projects at a given time and the need for union resources in connection with those projects. Total contributions to multi-employer pension plans, and the related number of employees covered by these plans, for the periods indicated ranged as follows (dollars in millions):
| Number of Employees |  | Contributions to Multi-Employer Plans (in millions)
For the Three Months Ended March 31, | Low |  | High |  | Pension |  | Post-Retirement Benefit |  | Total
2013 | 778 |  |  | 1,149 |  |  | $ | 7.6 |  |  | $ | 0.4 |  |  | $ | 8.0 |
2012 | 308 |  |  | 1,608 |  |  | $ | 3.4 |  |  | $ | 0.2 |  |  | $ | 3.6 |
The Company's contributions to multi-employer pension plans have increased in 2013 as a result of higher activity levels, primarily in its oil and gas business. On November 15, 2011, the Company, along with other members of the Pipe Line Contractors Association (“PLCA”), voluntarily withdrew from the Central States Southeast and Southwest Areas Pension Fund (“Central States”), a defined benefit multi-employer pension plan that is in critical status, as defined under the Pension Protection Act of 2006. In connection with this withdrawal, the Company recorded a withdrawal liability of $6.4 million. The Company withdrew from Central States in order to mitigate its liability in connection with the plan. The Company currently does not have plans to withdraw from any other multi-employer pension plan as of March 31, 2013. See Note 17 - Commitments and Contingencies for additional details.

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