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Debt And Credit Facilities (Narrative) (Details)
3 Months Ended9 Months Ended3 Months Ended
Mar. 31, 2011
USD ($)
Sep. 30, 2011
USD ($)
Sep. 30, 2011
Senior Notes [Member]
Consolidated Thompson [Member]
USD ($)
Sep. 30, 2010
Senior Notes $700 Million due 2021 [Member]
USD ($)
Sep. 30, 2011
Asia Pacific Iron Ore [Member]
Credit Facility Amendment [Member]
AUD
Sep. 30, 2011
Asia Pacific Iron Ore [Member]
Credit Facility Amendment [Member]
USD ($)
Mar. 31, 2010
Asia Pacific Iron Ore [Member]
Credit Facility Amendment [Member]
AUD
Mar. 31, 2010
Asia Pacific Iron Ore [Member]
Credit Facility Amendment [Member]
USD ($)
Sep. 30, 2011
Consolidated Thompson [Member]
USD ($)
Aug. 11, 2011
Consolidated Thompson [Member]
USD ($)
May 10, 2011
Consolidated Thompson [Member]
USD ($)
Mar. 31, 2011
Senior Notes 30-Year Tranche [Member]
USD ($)
Mar. 31, 2011
Senior Notes 10-Year Tranche [Member]
USD ($)
Sep. 30, 2011
Revolving Credit Facility [Member]
USD ($)
Dec. 31, 2010
Revolving Credit Facility [Member]
USD ($)
Sep. 30, 2011
Credit Facility Amendment [Member]
USD ($)
Aug. 11, 2011
Credit Facility Amendment [Member]
Sep. 30, 2011
Unsecured Credit Facility [Member]
USD ($)
Sep. 30, 2011
Senior Notes Due 2013 [Member]
USD ($)
Line of credit facility capacity               $ 600,000,000 $ 1,750,000,000 
Credit agreement additional borrowings 250,000,000                 
Scheduled principal payment 15,600,000                 
Senior notes  125,000,000500,000,000     250,000,000 300,000,000700,000,000      
Amended Total Funded Debt to EBITDA threashold                3.5  
Face Amount of Senior Long Term Notes1,000,000,000 100,000,000               270,000,000
Stated interest rate  8.50%        6.25%4.875%      
Discount interest rate on redemption           4025      
Premium on principal required to redeem notes101.00%                  
Redemption price, percent of principal in the event of change of control100.00%                  
Credit facility      40,000,00038,700,000  750,000,000      984,400,000 
Flexible financial covenants 

The credit agreement also provides for more flexible financial covenants and debt restrictions through the amendment of certain customary covenants, including the modification of the financial covenant that is based on our debt to earnings ratio. The amended debt to earnings ratio of Total Funded Debt to EBITDA, as those terms are defined in the agreement, as of the last day of each fiscal quarter cannot exceed (i) 3.5 to 1.0, if none of the $270 million private placement senior notes due 2013 remain outstanding, or otherwise (ii) the then applicable maximum multiple under the $270 million private placement senior notes due 2013.

                 
Credit facility long term                 922,100,000 
Customer borrowings          1,250,000,000        
Weighted average interest rate        2.56%          
Outstanding bank guarantees under credit facilities    24,400,00023,600,000       23,500,00064,700,000    
Credit facility remaining capacity    15,600,00015,100,000       1,476,500,000535,300,000    
Letters of Credit Outstanding, Amount        98,200,000          
Maturities of debt instruments in 2011 13,000,000                 
Maturities of debt instruments in 2012 75,000,000                 
Maturities of debt instruments in 2013 370,000,000                 
Maturities of debt instruments in 2014 125,000,000                 
Maturities of debt instruments in 2015 429,000,000                 
Maturities of debt instruments in 2016 549,000,000                 
Maturities of debt instruments after 2016 $ 2,400,000,000