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Employee Benefits - Assumptions Used in Determining Benefit Obligation (Details)
Dec. 31, 2018
Dec. 31, 2017
United Kingdom    
Defined Benefit Plan Disclosure [Line Items]    
Discount rate 2.90% 2.50%
Rate of compensation increase 3.70% 3.70%
Switzerland    
Defined Benefit Plan Disclosure [Line Items]    
Discount rate 0.80% 0.80%
Rate of compensation increase 2.00% 2.00%