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Pension Plans - Schedule of Assumptions Used (Details) | 12 Months Ended
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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%

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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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