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Related Party Transactions (Tables)
12 Months Ended
Dec. 31, 2012
Related Party Transactions [Abstract]  
Condensed financial statements
Summarized financial information for the unconsolidated mines is as follows:
 
2012
 
2011
 
2010
Statement of Operations
 
 
 
 
 
Revenues
$
543.9

 
$
502.6

 
$
461.7

Gross profit
$
74.5

 
$
71.7

 
$
71.7

Income before income taxes
$
46.8

 
$
47.0

 
$
43.4

Income from continuing operations
$
35.6

 
$
36.5

 
$
33.1

Net income
$
35.6

 
$
36.5

 
$
33.1

Balance Sheet
 
 
 
 
 
Current assets
$
148.6

 
$
144.1

 
 
Non-current assets
$
836.3

 
$
685.2

 
 
Current liabilities
$
144.3

 
$
162.1

 
 
Non-current liabilities
$
837.4

 
$
660.9