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Pension Plans - Schedule of Assumptions Used (Details)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
U.K.
Defined Benefit Plan Disclosure [Line Items]
Discount rate	1.40%	2.10%	2.90%
Expected return on assets	3.00%	4.10%	4.90%
Life expectancy of male in the U.K. aged 65 at accounting date	21 years 6 months	21 years 6 months
Life expectancy of female in the U.K. aged 65 at accounting date	24 years 3 months 18 days	24 years 2 months 12 days
Life expectancy of male in the U.K. aged 65 at 20 years after accounting date	22 years 10 months 24 days	22 years 9 months 18 days
Life expectancy of female in the U.K. aged 65 at 20 years after accounting date	25 years 9 months 18 days	25 years 8 months 12 days
U.K. | Retirement Plan Pre-2030
Defined Benefit Plan Disclosure [Line Items]
Retail Price Inflation	2.90%	2.90%	3.30%
Consumer Price Inflation	1.80%	2.00%	2.20%
U.K. | Retirement Plan Post-2030
Defined Benefit Plan Disclosure [Line Items]
Retail Price Inflation	2.70%	2.90%	3.30%
Consumer Price Inflation	2.60%	2.00%	2.20%
U.S.
Defined Benefit Plan Disclosure [Line Items]
Discount rate	2.30%	3.10%	4.20%
Expected return on assets	5.00%	6.20%	6.20%
Pre 6 April 1997 | U.K. | Retirement Plan Pre-2030
Defined Benefit Plan Disclosure [Line Items]
Rate of pension increases	1.70%	1.80%	2.00%
Pre 6 April 1997 | U.K. | Retirement Plan Post-2030
Defined Benefit Plan Disclosure [Line Items]
Rate of pension increases	2.20%	1.80%	2.00%
1997 To 2005 | U.K. | Retirement Plan Pre-2030
Defined Benefit Plan Disclosure [Line Items]
Rate of pension increases	1.90%	2.10%	2.20%
1997 To 2005 | U.K. | Retirement Plan Post-2030
Defined Benefit Plan Disclosure [Line Items]
Rate of pension increases	2.60%	2.10%	2.20%
Post 5 April 2005 | U.K. | Retirement Plan Pre-2030
Defined Benefit Plan Disclosure [Line Items]
Rate of pension increases	1.60%	1.70%	1.80%
Post 5 April 2005 | U.K. | Retirement Plan Post-2030
Defined Benefit Plan Disclosure [Line Items]
Rate of pension increases	2.00%	1.70%	1.80%

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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://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (k)(1)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

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Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (k)(3)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

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-Publisher FASB
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-Topic 715
-SubTopic 20
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-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2919-114920

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