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Investment Securities (Debt Securities Issued By Corporation) (Details) (Debt securities issued by industrial corporations, USD $)
Dec. 31, 2012
Dec. 31, 2011
Investment securities    
Fair value investments $ 2,385,100,000 [1] $ 2,135,100,000 [1]
AAA
   
Investment securities    
Fair value investments 0 0
AA
   
Investment securities    
Fair value investments 193,400,000 206,800,000
A
   
Investment securities    
Fair value investments 1,061,000,000 802,800,000
BBB
   
Investment securities    
Fair value investments 1,116,900,000 1,110,800,000
BB
   
Investment securities    
Fair value investments 7,000,000 6,200,000
Other
   
Investment securities    
Fair value investments $ 6,800,000 $ 8,500,000
[1] Credit ratings are assigned based on the following hierarchy: 1) Standard & Poor’s Financial Services LLC (“Standard & Poor’s”) and 2) Moody’s Investor Service (“Moody’s”)