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Other Retirement Plans (Tables)
 9 Months Ended
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