Hedging Activities (Narrative) (Details) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)	Dec. 31, 2014 financial_institution
General Discussion of Derivative Instruments and Hedging Activities [Abstract]
Number of financial institutions | financial_institution					4
Gain (loss) on fair value hedges recognized in earnings	$ 34.6	$ 2.2	$ (3.3)	$ (6.4)