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Receivables
 3 Months Ended
Mar. 31, 2012
Receivables [Abstract]  
Receivables
RECEIVABLES
Receivables consist of the following:
Dollar amounts in millions
March 31, 2012
 
December 31, 2011
Trade receivables
$
97.2

 
$
55.9

Interest receivables
3.3

 
1.2

Other receivables
8.1

 
9.1

Allowance of doubtful accounts
(1.2
)
 
(1.1
)
Total
$
107.4

 
$
65.1


Other receivables at March 31, 2012 and December 31, 2011 primarily consist of settlements, Canadian sales tax receivables, receivables from joint ventures and other items.