Quarterly report pursuant to Section 13 or 15(d)

Hedging Activities (Narrative) (Details)

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Hedging Activities (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
financial_institution
Sep. 30, 2012
Dec. 31, 2012
financial_institution
General Discussion of Derivative Instruments and Hedging Activities [Abstract]          
Number of financial institutions     4   4
Expected to reclassify out of accumulated other comprehensive income in next 12 months $ 2.6        
Gain on fair value hedge ineffectiveness, net (6.7) (0.2) (1.3) (0.1)  
Gain on fair value hedge ineffectiveness 5.2   (3.0)    
Loss related to amortization of OCI from hedging activity $ (3.6)   $ (6.5)