Derivative Instruments And Hedging Activities (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2013
Disclosure Derivative Instruments And Hedging Activities Narrative [Abstract]
Derivative, Notional Amount	$ 8.0	$ 38.0
Net cash outflow/inflow from settlement of derivative contracts	0.0	(13.6)	$ (16.0)
Derivative Liability	$ 0.1	$ 0.4