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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 $ 60.7 $ 60.0
Cash received for income taxes (2.6) (45.7)
Decrease in cash received for income taxes 43.1  
Significant noncash transactions    
Construction costs funded through accounts payable 98.4 78.8
Equity issued for stock-based compensation plans 26.5 0
Equity issued for reinvested dividends 9.1 0
BusinessAcquisitionContingentConsiderationandPayablesPotentialCashPayment $ 7.9 $ 0