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Other Retirement Plans(Tables)
 3 Months Ended
Mar. 31, 2013
Multiemployer Plans [Abstract]  
Schedule of Costs of Multiemployer Plans
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 March 31,
Low
 
High
 
Pension
 
Post-Retirement Benefit
 
Total
2013
778

 
1,149

 
$
7.6

 
$
0.4

 
$
8.0

2012
308

 
1,608

 
$
3.4

 
$
0.2

 
$
3.6