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Litigation Employee Benefit Plans Components of Net Periodic Benefit Cost (Credit) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Jun. 30, 2012
Sep. 30, 2012
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Pension and OPEB, Period Expense, Other $ 28.1 $ 28.7