Derivative Instruments And Hedging Activities (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2011
Disclosure Derivative Instruments And Hedging Activities Narrative [Abstract]
Derivative, Notional Amount	$ 216invest_DerivativeNotionalAmount	$ 300invest_DerivativeNotionalAmount
Net cash outflow/inflow from settlement of derivative contracts	$ (16.0)	$ 4.9	$ (13.0)

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 12

-Section 13

-Sentence Column B

Name:	invest_DerivativeNotionalAmount
Namespace Prefix:	invest_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant