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 12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
financial_institution
General Discussion of Derivative Instruments and Hedging Activities [Abstract]      
Number of financial institutions     4
Expected to reclassify out of accumulated other comprehensive income in next 12 months $ 9.1    
Loss on fair value hedge ineffectiveness $ 0.2 $ 0.3