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 6 Months Ended 12 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 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 $ 6.2        
Gain on fair value hedge ineffectiveness, net 5.5 0.3 5.4 0.1  
Gain on fair value hedge ineffectiveness 8.2   8.4    
Loss related to amortization of OCI from hedging activity $ (2.8)   $ (2.8)