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Changes in Level 3 Assets (Detail) (Auction Rate Securities, USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Auction Rate Securities
   
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair Value Assets Beginning Balance $ 97.8 $ 178.3
Total Gains and (Losses):    
Included in Earnings 0.1 [1] (1.5) [1]
Included in Other Comprehensive Income 2.7 [2] (0.2) [2]
Purchases, Issues, Sales, and Settlements    
Sales      
Settlements (1.0) (0.3)
Fair Value Assets Ending Balance $ 99.6 $ 176.3
[1] Realized gains for the three months ended March 31, 2013 of $0.1 million represent gains from redemptions by issuers. Realized losses for the three months ended March 31, 2012 of $1.5 million include $1.6 million of OTTI losses, partially offset by $0.1 million of gains from redemptions by issuers. Gains on redemptions are recorded in interest income and sales and impairment losses are recorded in investment security gains (losses), net, within the consolidated statement of income.
[2] Unrealized losses related to auction rate securities are included in net unrealized gains (losses) on securities available for sale, within the consolidated statement of comprehensive income.