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Other Retirement Plans(Tables)
 6 Months Ended
Jun. 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 to
Multi-Employer Plans
(in millions)
For the Three Months Ended June 30,
Low
 
High
 
Pension
 
Post-Retirement Benefit
 
Total
2013
1,149

 
2,392

 
$
7.9

 
$
0.4

 
$
8.3

2012
1,608

 
2,509

 
$
9.1

 
$
0.2

 
$
9.3

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

 
2,392

 
$
15.5

 
$
0.8

 
$
16.3

2012
308

 
2,509

 
$
12.5

 
$
0.4

 
$
12.9