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Other Retirement Plans (Tables)
 3 Months Ended
Mar. 31, 2014
Multiemployer Plans [Abstract]  
Schedule of Multi-Employer Plan Contribution Details
Total contributions to multi-employer plans, and the related number of employees covered by these plans, for the periods indicated ranged as follows:
 
Multi-Employer Plans
 
Covered Employees
 
Contributions (in millions)
For the Three Months Ended March 31,
Low
 
High
 
Pension
 
Post-Retirement Benefit
 
Total
2014
1,098

 
1,308

 
$
7.8

 
$
0.5

 
$
8.3

2013
778

 
1,149

 
$
8.3

 
$
0.8

 
$
9.1