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Retirement and Other Postretirement Benefit Plans - Schedule of Actual Allocations for the Pension Assets and Target Allocations by Asset Class (Details) | Dec. 31, 2020 | Dec. 31, 2019
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Change in plan assets: |  |
Percentage of Plan Assets | 100.00% | 100.00%
Target Allocations | 100.00% | 100.00%
Diversified Growth Funds |  |
Change in plan assets: |  |
Percentage of Plan Assets | 29.50% | 25.90%
Target Allocations | 27.10% | 22.30%
Index Linked Gilts |  |
Change in plan assets: |  |
Percentage of Plan Assets |  | 34.30%
Target Allocations |  | 33.40%
Fixed Interest Gilts |  |
Change in plan assets: |  |
Percentage of Plan Assets |  | 9.30%
Target Allocations |  | 9.10%
Liability Driven Investments |  |
Change in plan assets: |  |
Percentage of Plan Assets | 20.50% | 13.80%
Target Allocations | 23.90% | 16.50%
All Other Regions Equity Fund |  |
Change in plan assets: |  |
Percentage of Plan Assets | 5.10% | 9.20%
Target Allocations | 5.10% | 10.80%
U.K. Equity Fund |  |
Change in plan assets: |  |
Percentage of Plan Assets | 2.20% | 4.00%
Target Allocations | 2.20% | 4.70%
Diversified Investment, Funds |  |
Change in plan assets: |  |
Percentage of Plan Assets | 1.10% | 1.10%
Target Allocations | 1.10% | 1.10%
Insurance contracts |  |
Change in plan assets: |  |
Percentage of Plan Assets | 40.60% | 2.00%
Target Allocations | 40.60% | 2.10%
Cash and Cash Equivalents |  |
Change in plan assets: |  |
Percentage of Plan Assets | 1.00% | 0.40%

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- Definition Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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