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, 2014
Sep. 30, 2013
Sep. 30, 2014
financial_institution
Sep. 30, 2013
Dec. 31, 2013
financial_institution
General Discussion of Derivative Instruments and Hedging Activities [Abstract]          
Number of financial institutions     4   4
Gain on fair value hedge ineffectiveness, net $ 29.5 $ (6.7) $ 23.0 $ (1.3)