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Other Retirement Plans (Tables) | 12 Months Ended
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Dec. 31, 2013
Multi-Employer Plans [Line Items] |
Schedule of Contributions to Multi-Employer Plans | Total contributions to multi-employer 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)
| Low |  | High |  | Pension |  | Post-Retirement Benefit |  | Total
2013 | 778 |  |  | 2,734 |  |  | $ | 44.6 |  |  | $ | 3.6 |  |  | $ | 48.2 |
2012 | 308 |  |  | 2,509 |  |  | $ | 27.9 |  |  | $ | 1.3 |  |  | $ | 29.2 |
2011 | 308 |  |  | 1,538 |  |  | $ | 19.5 |  |  | $ | 1.2 |  |  | $ | 20.7 |
Multi-Employer Plans, Pension [Member] |
Multi-Employer Plans [Line Items] |
Schedule of Multi-Employer Pension Plans | Details of significant multi-employer pension plans as of and for the periods indicated, based upon information available to the Company from plan administrators as well as publicly available information on the U.S. Department of Labor website, are provided in the following table:
|  |  | Contributions (in millions) Years Ended December 31, |  | Pension Protection Act Zone Status |  |  |
Multi-Employer Pension Plan | Employer Identification Number | Plan Number | 2013 |  | 2012 |  | 2011 | Expiration Date of CBA | 2013 | As of |  | 2012 | As of |  | FIP/RP Status | Surcharge
Central Pension Fund of the IUOE and Participating Employers | 366052390 | 001 | $ | 10.8 |  |  | $ | 6.0 |  |  | $ | 4.4 |  | 01/31/2014 | Green | 01/31/2013 | (a) | Green | 01/31/2012 | (a) | NA | No
Pipeline Industry Pension Fund | 736146433 | 001 | 9.8 |  |  | 8.9 |  |  | 6.2 |  | 05/31/2014 | Green | 12/31/2012 | (b) | Green | 12/31/2011 | (b) | NA | No
Operating Engineers Local 324 Pension Fund | 381900637 | 001 | 4.5 |  |  | 0.8 |  |  | — |  | 01/31/2014 | Red | 04/30/2013 |  | Red | 04/30/2012 |  | Implemented | Yes
Michigan Laborers Pension Fund | 386233976 | 001 | 4.3 |  |  | 0.9 |  |  | 0.2 |  | 01/31/2014 | Yellow | 08/31/2013 | (a) | Green | 08/31/2012 |  | Implemented | No
Teamsters National Pipeline Pension Fund (c) | 461102851 | 001 | 2.7 |  |  | 1.4 |  |  | — |  | 01/31/2014 | Green | 12/31/2012 | (b) | NA | NA |  | NA | No
Eighth District Electrical Pension Fund | 846100393 | 001 | 2.2 |  |  | 1.3 |  |  | 0.5 |  | 02/28/2015 | Green | 03/31/2013 |  | Green | 03/31/2012 | (a) | Implemented | No
Laborers National Pension Fund | 751280827 | 001 | 1.1 |  |  | 1.5 |  |  | 0.5 |  | 01/31/2014 | Green | 12/31/2012 |  | Green | 12/31/2011 |  | NA | No
Laborers District Council and Contractors Pension Fund of Ohio | 316129964 | 001 | 0.7 |  |  | 0.1 |  |  | 0.1 |  | 01/31/2014 | Green | 12/31/2012 |  | Green | 12/31/2011 |  | NA | No
Midwest Operating Engineers Pension Trust Fund | 366140097 | 001 | 0.7 |  |  | 0.0 |  |  | — |  | 01/31/2014 | Yellow | 03/31/2013 | (a) | Green | 03/31/2012 | (a) | Implemented | Yes
I.B.E.W. Local 769 Management Pension Plan A | 866049763 | 001 | 0.7 |  |  | 0.1 |  |  | 0.0 |  | 07/30/2016 | Green | 06/30/2012 |  | Green | 06/30/2011 | (b) | NA | No
Laborers Local Union No. 158 Pension Fund | 236580323 | 001 | 0.5 |  |  | 0.6 |  |  | 0.7 |  | 01/31/2014 | Green | 12/31/2012 | (b) | Green | 12/31/2011 | (b) | NA | No
West Virginia Laborers Pension Trust Fund | 556026775 | 001 | 0.5 |  |  | 0.9 |  |  | 0.4 |  | 01/31/2014 | Green | 03/31/2013 |  | Green | 03/31/2012 |  | NA | No
Laborers District Council of Western Pennsylvania Pension Fund | 256135576 | 001 | 0.4 |  |  | 0.6 |  |  | 0.3 |  | 01/31/2014 | Red | 12/31/2012 |  | Yellow | 12/31/2011 |  | Implemented | Yes
Laborers Pension Trust Fund for Northern Nevada | 880138600 | 001 | 0.1 |  |  | 0.2 |  |  | 0.8 |  | 01/31/2014 | Green | 05/31/2013 |  | Green | 05/31/2012 | (b) | NA | No
Operating Engineers Pension Trust Fund | 946090764 | 001 | 0.0 |  |  | — |  |  | 1.2 |  | 01/31/2014 | Orange | 12/31/2012 |  | Orange | 12/31/2011 |  | Implemented | Yes
Central States, Southeast and Southwest Areas Pension Plan (d) | 366044243 | 001 | — |  |  | — |  |  | 0.9 |  | 01/31/2014 | Red | 12/31/2012 |  | Red | 12/31/2011 |  | Implemented | No
Other funds |  |  | 5.6 |  |  | 4.6 |  |  | 3.3 |  |  |  |  |  |  |  |  |  |
Total multi-employer pension plan contributions |  |  | $ | 44.6 |  |  | $ | 27.9 |  |  | $ | 19.5 |  |  |  |  |  |  |  |  |  |
(a) | This plan has utilized extended amortization provisions, which provide plans with extensions of time to amortize pension funding shortfalls.
(b) | The Company’s contributions to this plan represent greater than 5% of the plan's total contributions.
(c) | The Teamsters National Pipeline Pension Fund was established in 2012.
(d) | The Company’s subsidiary that participated in the Central States, Southeast and Southwest Areas Pension Plan voluntarily withdrew from this plan in November 2011. See discussion below and in Note 16 – Commitments and Contingencies.

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- Definition Tabular disclosure of the costs related to the various types of retirement plans including defined benefit pension plan cost, defined contribution plan cost, other postretirement benefit plan cost, and net periodic benefit cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the quantitative and qualitative information related to multiemployer plans in which the employer participates. A multiemployer plan is a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -URI http://asc.fasb.org/subtopic&trid=2235144 + Details
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