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CASH AND CASH EQUIVALENTS (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2012
month
Mar. 31, 2011
CASH AND CASH EQUIVALENTS    
Maximum term of original maturity to classify instruments as cash equivalent (in months) 3  
Supplemental disclosure of statements of cash flows    
Cash paid for interest $ 8.9 $ 20.1
Cash (received) paid for income taxes (33.2) 2.9
Significant noncash transactions    
Construction costs funded through accounts payable 50.2 9.4
Equity issued for stock-based compensation plans   6.6
Equity issued for reinvested dividends   $ 5.4