3. Fair Value Measurements Foreign Exchange Forward Contracts (Details) $ in Millions	12 Months Ended
Dec. 31, 2016 USD ($)
Forward foreign exchange contract to purchase foreign currency [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	$ 328.3
Loss on foreign currency derivative instruments not designated as hedging instruments	0.6
Forward foreign exchange contract to sell foreign currency [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	16.9
Loss on foreign currency derivative instruments not designated as hedging instruments	$ 0.1

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

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+ References

No definition available.

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- Definition

Amount of gain (loss) recognized in earnings in the period from the increase (decrease) in fair value of foreign currency derivatives not designated as hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624171-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5618551-113959

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