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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, 2021 | Dec. 31, 2020
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Change in plan assets: |  |
Percentage of Plan Assets | 100.00% | 100.00%
Percentage of Plan Assets | 100.00% | 100.00%
Diversified Growth Funds |  |
Change in plan assets: |  |
Percentage of Plan Assets | 3.40% | 29.50%
Percentage of Plan Assets | 3.40% | 27.10%
Index Linked Gilts |  |
Change in plan assets: |  |
Percentage of Plan Assets | 0.60% |
Percentage of Plan Assets | 0.60% |
Liability Driven Investments |  |
Change in plan assets: |  |
Percentage of Plan Assets |  | 20.50%
Percentage of Plan Assets |  | 23.90%
All Other Regions Equity Fund |  |
Change in plan assets: |  |
Percentage of Plan Assets |  | 5.10%
Percentage of Plan Assets |  | 5.10%
U.K. Equity Fund |  |
Change in plan assets: |  |
Percentage of Plan Assets |  | 2.20%
Percentage of Plan Assets |  | 2.20%
Diversified Investment, Funds |  |
Change in plan assets: |  |
Percentage of Plan Assets | 1.00% | 1.10%
Percentage of Plan Assets | 1.00% | 1.10%
Insurance contracts |  |
Change in plan assets: |  |
Percentage of Plan Assets | 94.20% | 40.60%
Percentage of Plan Assets | 94.20% | 40.60%
Cash and Cash Equivalents |  |
Change in plan assets: |  |
Percentage of Plan Assets | 0.80% | 1.00%
Percentage of Plan Assets | 0.80% |

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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=123450688&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=123447040&loc=d3e1928-114920 + Details
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