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FINANCIAL INSTRUMENTS (Details 2) (Cash Flow Hedges, USD $)
In Millions
3 Months Ended9 Months Ended
Sep. 30, 2011
Interest rate swaps
Recurring
Level 2
Dec. 31, 2010
Interest rate swaps
Recurring
Level 2
Sep. 30, 2011
Interest rate swaps and options
Sep. 30, 2010
Interest rate swaps and options
Sep. 30, 2011
Interest rate swaps and options
Sep. 30, 2010
Interest rate swaps and options
Derivative Financial Instruments      
Fair value of derivative contracts, current liability$ 3.4$ 13.8    
Interest expense on the interest rate swaps and options  $ 3.5$ 4.0$ 10.9$ 12.3