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DERIVATIVES AND OTHER FINANCIAL INSTRUMENTS (Details 3) (USD $)
In Millions
3 Months Ended9 Months Ended9 Months Ended1 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Dec. 31, 2010
Sep. 30, 2011
Fair value hedges
Interest Rate Swaps
Nov. 30, 2009
Interest Rate Swaps
Jul. 31, 2011
Interest Rate Swaps
Terminated contracts
Nov. 30, 2010
Interest Rate Swaps
Terminated contracts
Interest rate swap fair value hedges         
Basis for calculating fair value of swaps     LIBOR   
Notional Amount of Underlying Debt      $ 700.0  
Notional amount       500.0200.0
Cash received  23.5    23.515.6
(Gain) loss on marked to market of swaps(0.4) (4.2)      
(Gain) loss on marked to market of hedged items0.4 4.2      
Recognized in interest expense(0.4)(4.4)(6.3)(13.6)     
Amortization of basis adjustment for terminated interest rate swaps recognized in interest expense(2.1) (3.1)      
Total increase (decrease) in interest expense(2.5)(4.4)(9.4)(13.6)     
Money market funds, classified as Level Two$ 405.3 $ 405.3 $ 246.8