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Cash and Cash Equivalents (Parenthetical) (Detail) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Cash, Cash Equivalents Details [Line Items]    
Deposits at the Federal Reserve Bank earning interest at the Federal Funds target rate $ 76.9 $ 100.1
Interest-earning deposits in other financial institutions 267.2 371.5
Fair value of securities purchased under agreements to resell 164.8 179.1
Fair value of securities received as collateral that have been resold or repledged $ 0 $ 0