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Impaired Mortgage Loans (Detail) (USD $)
In Millions
Sep. 30, 2011
Dec. 31, 2010
Recorded Investment$ 32.7$ 22.9
Unpaid Principal Balance34.224.4
Related Allowance1.51.5
Impaired Fin Receivables with No Related Allowance [Member]
  
Recorded Investment19.69.8
Unpaid Principal Balance19.69.8
Related Allowance00
Impaired Fin Receivables with Allowance [Member]
  
Recorded Investment13.113.1
Unpaid Principal Balance14.614.6
Related Allowance$ 1.5$ 1.5