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Pension Plans - Schedule of Assumptions Used (Details)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
U.K.      
Defined Benefit Plan Disclosure [Line Items]      
Discount rate 2.90% 2.40% 2.60%
Expected return on assets 4.90% 4.80% 5.20%
Retail price inflation 3.30% 3.10% 3.20%
Consumer price inflation 2.20% 2.10% 2.20%
Life expectancy of male in the U.K. aged 65 at accounting date 21 years 5 months 21 years 7 months  
Life expectancy of female in the U.K. aged 65 at accounting date 24 years 1 month 24 years 7 months  
Life expectancy of male in the U.K. aged 65 at 20 years after accounting date 22 years 9 months 23 years 3 months  
Life expectancy of female in the U.K. aged 65 at 20 years after accounting date 25 years 8 months 26 years 6 months  
U.S.      
Defined Benefit Plan Disclosure [Line Items]      
Discount rate 4.20% 3.60% 4.20%
Expected return on assets 6.20% 6.00% 6.30%
Pre 6 April 1997 | U.K.      
Defined Benefit Plan Disclosure [Line Items]      
Rate of pension increases 2.00% 1.90% 2.00%
1997 To 2005 | U.K.      
Defined Benefit Plan Disclosure [Line Items]      
Rate of pension increases 2.20% 2.10% 2.20%
Post 5 April 2005 | U.K.      
Defined Benefit Plan Disclosure [Line Items]      
Rate of pension increases 1.80% 1.70% 1.80%