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Other Retirement Plans (Tables) | 9 Months Ended
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Sep. 30, 2015
Multiemployer Plans [Abstract] |
Schedule of Covered Employees and Contributions, Multi-Employer Plans | Total contributions to multi-employer plans, and the related number of employees covered by these plans, including with respect to the Company’s Canadian operations, for the periods indicated were as follows:
| Multi-Employer Plans
| Covered Employees |  | Contributions (in millions)
| Low |  | High |  | Pension |  | Post-Retirement Benefit |  | Total
For the Three Months Ended September 30: |  |  |  |  |  |  |  |  |
2015 | 1,689 |  |  | 2,463 |  |  | $ | 7.4 |  |  | $ | 2.2 |  |  | $ | 9.6 |
2014 | 2,029 |  |  | 2,167 |  |  | $ | 11.6 |  |  | $ | 1.1 |  |  | $ | 12.7 |
For the Nine Months Ended September 30: |  |  |  |  |  |  |  |  |
2015 | 590 |  |  | 2,463 |  |  | $ | 20.0 |  |  | $ | 6.6 |  |  | $ | 26.6 |
2014 | 1,098 |  |  | 2,167 |  |  | $ | 27.3 |  |  | $ | 2.5 |  |  | $ | 29.8 |

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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=58740216&loc=d3e1928-114920 + Details
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