Hedging Activities, Derivative Instruments and Credit Risk, Foreign Currency Forward Contracts (Details) - Foreign Currency Forwards [Member] $ in Millions	Dec. 31, 2018 USD ($) Contract
Derivative, Fair Value, Net [Abstract]
Number of contracts \| Contract	7
Minimum [Member]
Derivative, Fair Value, Net [Abstract]
Notional amount	$ 7.6
Maximum [Member]
Derivative, Fair Value, Net [Abstract]
Notional amount	$ 47.3

The number of derivative instruments of a particular group held by the entity.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5580258-113959

Name:	us-gaap_DerivativeNumberOfInstrumentsHeld
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant