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Securities Purchased Under Agreements to Resell and Securities Sold Under Agreements to Repurchase (Tables)
12 Months Ended
Dec. 31, 2011
Securities Purchased Under Agreements to Resell
SECURITIES PURCHASED UNDER
AGREEMENTS TO RESELL
   DECEMBER 31  
($ In Millions)    2011     2010  

Balance at December 31

   $ 74.7      $ 152.1   

Average Balance During the Year

     246.3        277.3   

Average Interest Rate Earned During the Year

     .07     .17

Maximum Month-End Balance During the Year

     424.2        578.0
Securities Sold Under Agreements to Repurchase
SECURITIES SOLD UNDER
AGREEMENTS TO REPURCHASE
   DECEMBER 31  
($ In Millions)    2011        2010  

Balance at December 31

   $ 1,198.8         $ 954.4   

Average Balance During the Year

     815.8           626.8   

Average Interest Rate Paid During the Year

     .08        .17

Maximum Month-End Balance During the Year

     1,479.3           954.4