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3. Fair Value Measurements Foreign Exchange Forward Contracts (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2018 USD ($)
Forward foreign exchange contract to purchase foreign currency [Member] |
Derivatives, Fair Value [Line Items] |
Derivative, Notional Amount | $ 284.5
Gain (loss) on foreign currency derivative instruments not designated as hedging instruments | (0.5)
Forward foreign exchange contract to sell foreign currency [Member] |
Derivatives, Fair Value [Line Items] |
Derivative, Notional Amount | 50.6
Gain (loss) on foreign currency derivative instruments not designated as hedging instruments | $ 0.2

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References 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 + Details
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