Derivative Financial Instruments (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Cash flow hedge instrument term, maximum historical term	12 months
Cash flow hedge instrument term, maximum	18 months
Cumulative unrealized gain (loss) on cash flow derivative instruments in accumulated other comprehensive loss	$ 2.3	$ 8.3