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DEBT (Long-term debt) (Table) (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Sep. 30, 2012
Sep. 30, 2013
Revolving credit facility [Member]
Sep. 30, 2013
Senior notes due 2013 [Member]
Sep. 30, 2013
Senior notes due 2015 [Member]
Dec. 31, 2012
Senior notes due 2015 [Member]
Sep. 30, 2013
Senior notes due 2016 [Member]
Dec. 31, 2012
Senior notes due 2016 [Member]
Sep. 30, 2013
Senior notes due 2017 [Member]
Dec. 31, 2012
Senior notes due 2017 [Member]
Aug. 23, 2012
Senior notes due 2017 [Member]
Sep. 30, 2013
Senior notes due 2020 [Member]
Nov. 19, 2010
Senior notes due 2020 [Member]
Sep. 30, 2013
Senior notes due 2022 [Member]
Dec. 31, 2012
Senior notes due 2022 [Member]
Aug. 23, 2012
Senior notes due 2022 [Member]
Debt Instrument [Line Items]                                  
Debt to EBITDA (Leverage) Ratio 2.09                                
Total long-term debt $ 2,553.5 $ 2,175.0       $ 250.0 $ 250.0 $ 325.0 $ 325.0 $ 500.0 $ 500.0   $ 606.5   $ 500.0 $ 500.0  
Debt Instrument, Face Amount                         600.0        
Long-term Line of Credit     $ 0 $ 372.0                          
Stated interest rate percentage         5.50% 5.625%   3.125%   2.20%   2.20% 4.625% 4.625% 3.75%   3.75%