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DEBT (2011 Senior Notes Offering) (Details) (USD $)
9 Months Ended9 Months Ended9 Months Ended12 Months Ended
Sep. 30, 2011
Dec. 31, 2010
Sep. 30, 2010
Dec. 31, 2009
Mar. 24, 2011
Floating Rate Senior Notes due 2014 [Member]
March 2011 Senior Notes [Member]
Mar. 24, 2011
3.20% Senior Notes Due 2016 [Member]
March 2011 Senior Notes [Member]
Mar. 24, 2011
4.70% Senior Notes Due 2021 [Member]
March 2011 Senior Notes [Member]
Mar. 24, 2011
5.75% Senior Notes Due 2040 [Member]
March 2011 Senior Notes [Member]
Nov. 17, 2009
5.75% Senior Notes Due 2040 [Member]
March 2011 Senior Notes [Member]
Sep. 30, 2011
Credit Facilities [Member]
March 2011 Senior Notes [Member]
Sep. 30, 2011
March 2011 Senior Notes [Member]
Mar. 24, 2011
March 2011 Senior Notes [Member]
Sep. 30, 2011
Credit Facilities [Member]
Sep. 30, 2011
7.50% Senior Notes Due 2011 [Member]
Sep. 30, 2011
Floating Rate Senior Notes due 2014 [Member]
Mar. 24, 2011
Floating Rate Senior Notes due 2014 [Member]
Sep. 30, 2011
3.20% Senior Notes Due 2016 [Member]
Sep. 30, 2011
4.70% Senior Notes Due 2021 [Member]
Sep. 30, 2011
5.75% Senior Notes Due 2040 [Member]
Sep. 30, 2011
4.75% Senior Notes Due 2020 [Member]
Dec. 31, 2010
4.75% Senior Notes Due 2020 [Member]
Debt instrument, interest rate             7.50%  3.20%4.70%5.75%4.75% 
Debt instrument, maturity dateJul. 01, 2011Mar. 24, 2014Apr. 01, 2016Apr. 01, 2021Jan. 30, 2040Jan. 30, 2020
Debt offering amount    $ 200,000,000$ 300,000,000$ 550,000,000$ 200,000,000$ 250,000,000  $ 1,250,000,000         
Debt Instrument Interest Rate In Excess Of Libor1.125%0.40%             0.85%     
Debt instrument Original Discount     300,000900,0005,500,000             
Debt instrument, effective interest rate     3.22%4.72%5.95%             
LIBOR rate              0.37%      
Debt issuance cost          10,400,000          
Use of proceeds from debt issuance         485,000,000750,000,000          
Cash and cash equivalents110,825,000449,301,000369,261,000534,256,000        90,000,000        
Fair value basis adjustment of hedged debt (increases)                $ 12,000,000  $ 42,300,000$ 10,500,000