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Other Retirement Plans (Tables)
 6 Months Ended
Jun. 30, 2014
Multiemployer Plans [Abstract]  
Schedule of Multi-Employer Plan Covered Employees and Contributions
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 June 30:
Low
 
High
 
Pension
 
Post-Retirement Benefit
 
Total
2014
1,308

 
2,167

 
$
8.0

 
$
0.8

 
$
8.8

2013
1,149

 
2,392

 
$
7.2

 
$
1.1

 
$
8.3

For the Six Months Ended June 30:
Low
 
High
 
Pension
 
Post-Retirement Benefit
 
Total
2014
1,098

 
2,167

 
$
15.8

 
$
1.3

 
$
17.1

2013
778

 
2,392

 
$
15.3

 
$
2.0

 
$
17.3