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Other Retirement Plans(Tables)
 9 Months Ended
Sep. 30, 2013
Multiemployer Plans [Abstract]  
Schedule of Multiemployer Plan Contributions and Covered Employees
Total contributions to multi-employer pension plans, and the related number of employees covered by these plans, for the periods indicated ranged as follows (dollars in millions):
 
Number of Employees
 
Contributions (in millions)
For the Three Months Ended September 30,
Low
 
High
 
Pension
 
Post-Retirement Benefit
 
Total
2013
2,392

 
2,734

 
$
14.8

 
$
1.0

 
$
15.8

2012
1,575

 
2,509

 
$
8.7

 
$
0.3

 
$
9.0

For the Nine Months Ended September 30,
Low
 
High
 
Pension
 
Post-Retirement Benefit
 
Total
2013
778

 
2,734

 
$
29.6

 
$
2.9

 
$
32.5

2012
308

 
2,509

 
$
21.1

 
$
0.8

 
$
21.9