DEBT AND CREDIT FACILITIES (Narrative) (Details)				0 Months Ended	12 Months Ended		12 Months Ended					12 Months Ended			0 Months Ended	3 Months Ended		12 Months Ended			3 Months Ended		12 Months Ended											12 Months Ended				12 Months Ended
	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Aug. 11, 2011 Term Loan [Member] USD ($)	May 27, 2010 Amapa's Debt [Member] USD ($)	Dec. 31, 2014 Senior Notes - $400 Million [Member] USD ($)	Dec. 31, 2013 Senior Notes - $400 Million [Member] USD ($)	Dec. 31, 2014 Senior Notes - $400 Million [Member] Maximum [Member]	Dec. 31, 2014 Senior Notes - $400 Million [Member] Minimum [Member]	Dec. 31, 2014 Five Hundred Million Four Point Eight Zero Percent Senior Note [Member] USD ($)	Dec. 31, 2013 Five Hundred Million Four Point Eight Zero Percent Senior Note [Member] USD ($)	Dec. 31, 2014 Five Hundred Million Six Point Two Five Percent Two Thousand And Forty [Member] USD ($)	Dec. 31, 2014 Senior Notes10 Year Tranche [Member] USD ($)	Dec. 31, 2014 Seven Hundred Million Four Point Eight Seven Five Two Thousand Twenty-one Senior Note [Member] USD ($)	Dec. 31, 2013 Seven Hundred Million Four Point Eight Seven Five Two Thousand Twenty-one Senior Note [Member] USD ($)	Sep. 22, 2010 Revolving Credit Facility [Member] USD ($)	Dec. 31, 2014 Revolving Credit Facility [Member] USD ($)		Dec. 31, 2013 Revolving Credit Facility [Member] USD ($)		Sep. 30, 2014 Revolving Credit Facility [Member] USD ($)	Dec. 31, 2012 $270 Million Senior Notes [Member] USD ($)	Dec. 31, 2012 Series Two Thousand And Eight Tranche B [Member] USD ($)	Dec. 31, 2014 Senior Notes Five Hundred Million [Member]	Dec. 31, 2014 Senior Notes Five Hundred Million [Member] Maximum [Member]	Dec. 31, 2014 Senior Notes Five Hundred Million [Member] Minimum [Member]	Dec. 31, 2014 Five Hundred Million Three Point Nine Five Two Thousand Eighteen Senior Note [Member] USD ($)	Dec. 31, 2013 Five Hundred Million Three Point Nine Five Two Thousand Eighteen Senior Note [Member] USD ($)	Dec. 31, 2014 Equipment Loans [Member] USD ($)	Dec. 31, 2014 Line of Credit [Member] USD ($)	Dec. 31, 2014 Line of Credit [Member] AUD	Dec. 31, 2013 Line of Credit [Member] USD ($)	Dec. 31, 2013 Line of Credit [Member] AUD	Dec. 31, 2014 Senior Notes30 Year Tranche [Member] USD ($)	Dec. 31, 2014 Senior Notes One Billion Two Thousand Eleven Offering [Member] USD ($)	Dec. 31, 2014 Senior Notes One Billion Two Thousand Eleven Offering [Member] Maximum [Member]	Dec. 31, 2014 Senior Notes One Billion Two Thousand Eleven Offering [Member] Minimum [Member]	Dec. 31, 2014 Senior Notes One Billion Two Thousand Ten Offering [Member] USD ($)	Dec. 31, 2014 Senior Notes One Billion Two Thousand Ten Offering [Member] Maximum [Member]	Dec. 31, 2014 Senior Notes One Billion Two Thousand Ten Offering [Member] Minimum [Member]
Line of Credit Facility [Line Items]
liquidity test																$ 400,000,000
Stock Repurchase Program, Authorized Amount	200,000,000
Debt Instrument, Repurchased Face Amount					5,000,000				10,000,000				10,000,000													20,000,000
Long-term Line of Credit, Noncurrent			200,000,000
Repayments of Debt				100,800,000											350,000,000						270,000,000	55,000,000
Revolving credit facility, borrowing capacity																													2,500,000	3,000,000	26,800,000	30,000,000
Debt Instrument, Face Amount					400,000,000	400,000,000			500,000,000.0	500,000,000	500,000,000		700,000,000	700,000,000												500,000,000	500,000,000.0						300,000,000	1,000,000,000			1,000,000,000
Financial covenant, interest coverage ratio																3.5		2.5
Credit facility, amount outstanding																0	[1]	0	[1]										1,200,000	1,500,000	20,500,000	23,000,000
Credit facility remaining capacity																1,000,000,000		1,700,000,000											1,300,000	1,500,000	6,300,000	7,000,000
Letters of credit outstanding		48,000,000
Time Period During Which Senior Notes May Be Redeemed at Company's Option, Number of Days From When Prior Notice Sent to Holders							60 days	30 days																60 days	30 days										60 days	30 days		60 days	30 days
Note Redemption Price, Percent of Principal Amount to be Redeemed					100.00%																		100.00%											100.00%			100.00%
Redemption Price, Percent Of Principal In The Event Of Change Of Control					101.00%																		101.00%											101.00%
Debt Instrument, Par Value	4,144,800,000	4,814,800,000			395,000,000	400,000,000			490,000,000	500,000,000			690,000,000	700,000,000		1,125,000,000		1,750,000,000		1,250,000,000						480,000,000	500,000,000	164,800,000
Percentage of Stock to Pledge																65.00%
Total Funded Debt to Total Capitalization																0.45
Debt to Earnings																				3.5
Limit on Increase in Interest Rate Above Initial Interest Rate, Based on Rating Events																							2.00%
Debt Instrument, Redemption Period, Time Period Prior to Maturity Date												3 months
Note Redemption Price if Redemption Period is During Specified Time Period, Percent of Principal Amount to be Redeemed												100.00%
Senior Notes, Noncurrent									$ 500,000,000			$ 700,000,000
Debt Instrument, Interest Rate, Stated Percentage					5.90%	5.90%			4.80%	4.80%			4.875%													3.95%
Interest Rate Due to Rating Downgrades																										5.70%

[1] As of December 31, 2014 and 2013, no revolving loans were drawn under the credit facility. We had total availability of $1.125 billion and $1.75 billion on our credit facility as of December 31, 2014 and 2013, respectively. Additionally, as of December 31, 2014 and December 31, 2013, the principal amount of letter of credit obligations totaled $149.5 million and $8.4 million, respectively, thereby reducing available borrowing capacity to $1.0 billion and $1.7 billion for each period, respectively.