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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
Jun. 30, 2013
Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]    
Adjusted cost basis   $ 14.6 [1]
Gross cumulative unrealized (losses)/gains   (0.2)
Fair Value [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Auction rate securities, fair value 9.3 14.4
Asset-backed Securities [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Adjusted cost basis 10.3 [1] 12.9 [1]
Gross cumulative unrealized (losses)/gains (1.0) (1.2)
Auction rate securities, fair value 9.3 11.7
Collateralized Debt Obligations [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Adjusted cost basis   1.7 [1]
Gross cumulative unrealized (losses)/gains   1.0
Collateralized Debt Obligations [Member] | Fair Value [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Auction rate securities, fair value   $ 2.7
[1] Adjusted cost basis reflects adjustments for credit and other losses recognized in earnings on our structured finance security. There were no adjustments to the cost basis of securities held as of June 30, 2013. Cumulative adjustments to the cost basis of securities held as of December 31, 2012 totaled $3.3 million. Par value of securities held as of June 30, 2013 and December 31, 2012 totaled $10.3 million and $17.9 million, respectively.