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Other Retirement Plans (Tables)
 9 Months Ended
Sep. 30, 2014
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, for the periods indicated ranged as follows:
 
Multi-Employer Plans
 
Covered Employees
 
Contributions (in millions)
For the Three Months Ended September 30:
Low
 
High
 
Pension
 
Post-Retirement Benefit
 
Total
2014
2,029

 
2,167

 
$
11.6

 
$
1.1

 
$
12.7

2013
2,392

 
2,734

 
$
14.9

 
$
1.0

 
$
15.9

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

 
2,167

 
$
27.3

 
$
2.5

 
$
29.8

2013
778

 
2,734

 
$
30.2

 
$
3.0

 
$
33.2