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Defined Benefit Plan, Assumptions Used (Details)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Domestic Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Discount rate 4.30% 3.65% 4.15%
Expected return on plan assets 7.50% 7.45% 7.50%
Rate of compensation increase 4.00% 4.00% 4.00%
Other Postretirement Benefits Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Discount rate 4.35% 3.65% 4.20%
Rate of compensation increase 4.00% 4.00% 4.00%
UNITED KINGDOM | Foreign Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Discount rate 2.95% 2.75% 2.70%
Expected return on plan assets 5.10% 5.10% 5.00%
Rate of compensation increase 3.40% 3.40% 3.45%