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Fair Value Measurements Recurring (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Assets $ 0 $ 0
Derivative Financial Instruments, Liabilities, Fair Value Disclosure $ 2.5 $ 4.0