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Securities Available For Sale (Auction Rate Securities Reconciliation Of Cost Basis To Fair Value) (Detail) (Auction Rate Securities [Member], USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]    
Adjusted Cost Basis $ 14.6 [1] $ 14.6 [1]
Gross Cumulative Unrealized (Losses)/Gains 0.2 (0.2)
Fair Value 14.8 [2] 14.4 [2]
Asset-backed Securities [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Adjusted Cost Basis 12.9 [1] 12.9 [1]
Gross Cumulative Unrealized (Losses)/Gains (1.1) (1.1)
Fair Value 11.7 11.7
Collateralized Debt Obligations [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Adjusted Cost Basis 1.7 [1] 1.7 [1]
Gross Cumulative Unrealized (Losses)/Gains 1.3 0.9
Fair Value $ 3.0 $ 2.7
[1] Adjusted cost basis reflects adjustments for credit and other losses recognized in earnings on our structured finance security. Cumulative adjustments to the cost basis of securities held as of both March 31, 2013 and December 31, 2012 totaled $3.3 million. Par value of securities held as of both March 31, 2013 and December 31, 2012 totaled $17.9 million.
[2] The Company’s auction rate securities maintain split ratings. For purposes of this table, securities are categorized according to their lowest rating.