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CASH AND CASH EQUIVALENTS (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Supplemental disclosure of statements of cash flows    
Cash paid for interest $ 0.6 $ 0.7
Cash received for income taxes (1.1) (24.6)
Decrease in income taxes payment 23.5  
Significant noncash transactions    
Construction costs funded through accounts payable $ 22.3 $ 11.8