Quarterly report pursuant to Section 13 or 15(d)

DEBT AND CREDIT FACILITIES (Narrative) (Details)

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DEBT AND CREDIT FACILITIES (Narrative) (Details)
 3 Months Ended 12 Months Ended 3 Months Ended 3 Months Ended
Mar. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Mar. 31, 2013
Term Loan [Member]
USD ($)
Dec. 31, 2012
Unsecured Credit Facility [Member]
Quarter
Mar. 31, 2013
Revolving Loan [Member]
USD ($)
Dec. 31, 2012
Revolving Loan [Member]
USD ($)
Mar. 31, 2013
Revolving Loan [Member]
Maximum [Member]
Mar. 31, 2013
Letter of Credit [Member]
USD ($)
Mar. 31, 2013
Senior Notes - $500 Million [Member]
USD ($)
Dec. 31, 2012
Senior Notes - $500 Million [Member]
USD ($)
Dec. 31, 2012
$270 Million Senior Notes [Member]
USD ($)
Mar. 31, 2013
10-year Tranche - $700 million 4.88% Senior Notes due 2021 [Member]
USD ($)
Dec. 31, 2012
10-year Tranche - $700 million 4.88% Senior Notes due 2021 [Member]
USD ($)
Mar. 31, 2013
10-year Tranche - $500 million 4.80% Senior Notes due 2020 [Member]
USD ($)
Dec. 31, 2012
10-year Tranche - $500 million 4.80% Senior Notes due 2020 [Member]
USD ($)
Mar. 31, 2013
$800 Million 6.25% 2040 Senior Notes [Member]
USD ($)
Dec. 31, 2012
$800 Million 6.25% 2040 Senior Notes [Member]
USD ($)
Mar. 31, 2013
$400 Million 5.90% 2020 Senior Notes [Member]
USD ($)
Dec. 31, 2012
$400 Million 5.90% 2020 Senior Notes [Member]
USD ($)
Mar. 31, 2013
Term Loan - $1.25 Billion [Member]
USD ($)
Dec. 31, 2012
Term Loan - $1.25 Billion [Member]
USD ($)
Mar. 31, 2013
Bank Contingent Instrument Facility and Cash Advance Facility [Member]
USD ($)
Mar. 31, 2013
Bank Contingent Instrument Facility and Cash Advance Facility [Member]
AUD
Dec. 31, 2012
Bank Contingent Instrument Facility and Cash Advance Facility [Member]
USD ($)
Dec. 31, 2012
Bank Contingent Instrument Facility and Cash Advance Facility [Member]
AUD
Line of Credit Facility [Line Items]                                                  
Term Loan Original Amount                                       $ 0 $ 1,250,000,000        
Long-term Debt, Gross 3,433,000,000 4,054,800,000             495,900,000 [1] 495,700,000 [1]   699,400,000 699,400,000 [2] 499,200,000 [3] 499,200,000 [3] 790,200,000 [4] 790,200,000 [4] 398,300,000 [5] 398,200,000 [5]   847,100,000 [6]        
Revolving credit facility, borrowing capacity                                           41,700,000 40,000,000 41,600,000  
Financial covenant, debt to earnings ratio       3.5                                          
Debt instrument, face amount 4,650,000,000 5,497,100,000     1,750,000,000.00 1,750,000,000.00     500,000,000.0 500,000,000.0 270,000,000 700,000,000 700,000,000 500,000,000 500,000,000 800,000,000 800,000,000 400,000,000 400,000,000   847,100,000        
Number of preceding quarters to calculate financial covenant       4                                          
Financial covenant, interest coverage ratio       2.50 2.5                                        
Extinguishment of Debt, Amount     847,100,000                                            
Deferred Finance Costs, Net     7,100,000                                            
Stated interest rate                 3.95%     4.875%   4.80%   6.25%   5.90%              
Credit facility, amount outstanding         550,000,000 [7] 325,000,000 [7]   27,700,000                           35,400,000 34,000,000 26,000,000 25,000,000
Credit facility remaining capacity         1,200,000,000 1,400,000,000                               6,300,000 6,000,000 15,600,000 15,000,000
Letters of credit outstanding 95,000,000 96,900,000                                              
Debt Instrument, Unamortized Discount                 4,100,000 4,300,000   600,000   800,000   9,800,000   1,700,000 1,800,000            
Debt Instrument, Minimum Tangible Net Worth Required Under Agreement, as of the End of Each Fiscal Quarter in the Next Fiscal Year           $ 4,600,000,000                                      
Debt Instrument, Maximum Total Funded Debt to Capitalization Required Until the End of the Next Fiscal Year End         52.50%                                        
Potential Increase in Borrowing Costs on Outstanding Borrowings             0.50%                                    
Potential Increase in Borrowing Costs on Unused Borrowing Capacity         0.10%                                        
[1] As of March 31, 2013 and December 31, 2012, the $500 million 3.95 percent senior notes were recorded at a par value of $500 million less unamortized discounts of $4.1 million and $4.3 million, respectively, based on an imputed interest rate of 4.14 percent.
[2] As of March 31, 2013 and December 31, 2012, the $700 million 4.875 percent senior notes were recorded at a par value of $700 million less unamortized discounts of $0.6 million, based on an imputed interest rate of 4.89 percent.
[3] As of March 31, 2013 and December 31, 2012, the $500 million 4.80 percent senior notes were recorded at a par value of $500 million less unamortized discounts of $0.8 million, based on an imputed interest rate of 4.83 percent.
[4] As of March 31, 2013 and December 31, 2012, the $800 million 6.25 percent senior notes were recorded at par value of $800 million less unamortized discounts of $9.8 million, based on an imputed interest rate of 6.34 percent.
[5] As of March 31, 2013 and December 31, 2012, the $400 million 5.90 percent senior notes were recorded at a par value of $400 million less unamortized discounts of $1.7 million and $1.8 million, respectively, based on an imputed interest rate of 5.98 percent.
[6] As of March 31, 2013, the term loan was repaid in full. During the first quarter of 2013, repayments totaling $847.1 million were made. As of December 31, 2012, $402.8 million had been paid down on the original $1.25 billion term loan and, of the remaining term loan $94.1 million, was classified as Current portion of debt. The current classification was based upon the principal payment terms of the arrangement requiring principal payments on each three-month anniversary following the funding of the term loan.
[7] As of March 31, 2013 and December 31, 2012, $550.0 million and $325.0 million revolving loans were drawn under the credit facility, respectively, and the principal amount of letter of credit obligations totaled $27.7 million for each period, thereby reducing available borrowing capacity to $1.2 billion and $1.4 billion for each period, respectively.