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Financial Instruments and Guarantees with Off-Balance-Sheet Risk (Tables)
 3 Months Ended
Mar. 31, 2013
Financial Instruments And Guarantees With Off Balance Sheet Risk Disclosure [Abstract]  
Financial instruments with off-balance sheet risk:
As of March 31, 2013, the Company had the following financial instruments with off-balance sheet risk:
 
Reclamation
Obligations
 
Lease
Obligations
 
Workers’
Compensation
Obligations
 
Other(1)
 
Total
 
(Dollars in millions)
Self bonding
$
1,242.5

 
$
—

 
$
—

 
$
—

 
$
1,242.5

Surety bonds
316.4

 
105.1

 
30.9

 
8.9

 
461.3

Bank guarantees
282.1

 
—

 
—

 
169.3

 
451.4

Letters of credit
—

 
—

 
32.6

 
79.7

 
112.3

 
$
1,841.0

 
$
105.1

 
$
63.5

 
$
257.9

 
$
2,267.5

(1) 
Other includes the $79.7 million in letters of credit described below and an additional $178.2 million in bank guarantees and surety bonds related to collateral for surety companies, road maintenance, performance guarantees and other operations.