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DEBT SECURITIES HELD BY AND CUSTOMER DEPOSITS AT SAVINGS BANK SUBSIDIARY. (Debt Securities) (Detail) (USD $)
In Millions, unless otherwise specified
6 Months Ended
Jun. 30, 2011
Dec. 31, 2010
Investments with temporary impairment (41 securities in 2011) of (fair values)    
Total debt securities $ 191.8 $ 184.7
Aggregate cost 188.4 181.4
Investments with temporary impairment (41 securities in 2011) of (unrealized holding gains (losses))    
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Cause
The unrealized losses in these investments were generally caused by changes in interest rates and market liquidity, and not by changes in credit quality.
 
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Other
We intend to hold these securities to their maturities, which generally correlate to the maturities of our customer deposits, and believe it is more-likely-than not that we will not be required to sell any of these securities before recovery of their amortized cost. Accordingly, impairment of these investments is considered temporary.
 
Debt securities held by savings bank subsidiary [Member]
   
Investments with temporary impairment (41 securities in 2011) of (fair values)    
Less than 12 months 25.1 25.0
12 months or more 5.0 6.1
Total fair value of investments with temporary impairment 30.1 31.1
Fair value of investments with unrealized holding gains 161.7 153.6
Investments with temporary impairment (41 securities in 2011) of (unrealized holding gains (losses))    
Less than 12 months (0.2) (0.4)
12 months or more (0.2) (0.4)
Unrealized holding losses (0.4) (0.8)
Unrealized holding gains 3.8 4.1
Unrealized holding gains (losses) $ 3.4 $ 3.3
Investments with temporary impairment (number of securities) 41