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Commitments, Contingencies and Guarantees (Details)
€ in Millions, $ in Millions
Dec. 31, 2017
USD ($)
Dec. 31, 2017
EUR (€)
Dec. 31, 2015
USD ($)
Dec. 31, 2015
EUR (€)
Litigation        
Amount of fine $ 3.9 € 3.3 $ 5.4 € 5.0