Quarterly report pursuant to Section 13 or 15(d)

Hedging Activities (Narrative) (Details)

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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)