XML 142 R86.htm IDEA: XBRL DOCUMENT v3.20.1
Pension Plans - Schedule of Assumptions Used (Details)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
U.K.      
Defined Benefit Plan Disclosure [Line Items]      
Discount rate 2.10% 2.90% 2.40%
Expected return on assets 4.10% 4.90% 4.80%
Retail price inflation 2.90% 3.30% 3.10%
Consumer price inflation 2.00% 2.20% 2.10%
Life expectancy of male in the U.K. aged 65 at accounting date 21 years 6 months 21 years 4 months 24 days  
Life expectancy of female in the U.K. aged 65 at accounting date 24 years 2 months 12 days 24 years 1 month 6 days  
Life expectancy of male in the U.K. aged 65 at 20 years after accounting date 22 years 9 months 22 years 9 months 18 days  
Life expectancy of female in the U.K. aged 65 at 20 years after accounting date 25 years 8 months 25 years 8 months 12 days  
U.S.      
Defined Benefit Plan Disclosure [Line Items]      
Discount rate 3.10% 4.20% 3.60%
Expected return on assets 6.20% 6.20% 6.00%
Pre 6 April 1997 | U.K.      
Defined Benefit Plan Disclosure [Line Items]      
Rate of pension increases 1.80% 2.00% 1.90%
1997 To 2005 | U.K.      
Defined Benefit Plan Disclosure [Line Items]      
Rate of pension increases 2.10% 2.20% 2.10%
Post 5 April 2005 | U.K.      
Defined Benefit Plan Disclosure [Line Items]      
Rate of pension increases 1.70% 1.80% 1.70%