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3. Fair Value Measurements Foreign Exchange Forward Contracts (Details)
$ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
Forward foreign exchange contract to purchase foreign currency [Member]  
Derivatives, Fair Value [Line Items]  
Gain (loss) on foreign currency derivative instruments not designated as hedging instruments $ (0.3)
Derivative, Notional Amount 269.1
Forward foreign exchange contract to sell foreign currency [Member]  
Derivatives, Fair Value [Line Items]  
Gain (loss) on foreign currency derivative instruments not designated as hedging instruments 0.3
Derivative, Notional Amount $ 52.0