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CASH AND CASH EQUIVALENTS (Details) (USD $)
In Millions, unless otherwise specified
9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Supplemental disclosure of statements of cash flows    
Cash paid for interest $ 22.7 $ 20.8
Cash received for income taxes (2.4) (14.2)
Decrease in cash received for income taxes 11.8  
Significant noncash transactions    
Construction costs funded through accounts payable $ 29.5 $ 15.8