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Other Retirement Plans(Tables) | 6 Months Ended
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Jun. 30, 2013
Multiemployer Plans [Abstract] |
Schedule of Multiemployer Plan Contributions and Covered Employees | 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 June 30, | Low |  | High |  | Pension |  | Post-Retirement Benefit |  | Total
2013 | 1,149 |  |  | 2,392 |  |  | $ | 7.9 |  |  | $ | 0.4 |  |  | $ | 8.3 |
2012 | 1,608 |  |  | 2,509 |  |  | $ | 9.1 |  |  | $ | 0.2 |  |  | $ | 9.3 |
For the Six Months Ended June 30, | Low |  | High |  | Pension |  | Post-Retirement Benefit |  | Total
2013 | 778 |  |  | 2,392 |  |  | $ | 15.5 |  |  | $ | 0.8 |  |  | $ | 16.3 |
2012 | 308 |  |  | 2,509 |  |  | $ | 12.5 |  |  | $ | 0.4 |  |  | $ | 12.9 |

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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=21915506&loc=d3e1928-114920 + Details
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