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Retirement Plans - Plan Asset Allocation (Details) | Dec. 31, 2020 | Dec. 31, 2019
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U.S. |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total asset allocation | 100.00% | 100.00%
U.S. | Equity securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total asset allocation | 23.40% | 21.40%
U.S. | Fixed income securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total asset allocation | 67.20% | 69.30%
U.S. | Alternative strategies |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total asset allocation | 6.20% | 5.90%
U.S. | Cash, cash equivalents and short-term investment funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total asset allocation | 3.10% | 3.40%
U.K Plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total asset allocation | 100.00% | 100.00%
U.K Plan | Equity securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total asset allocation | 17.10% | 17.90%
U.K Plan | Fixed income securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total asset allocation | 67.40% | 68.30%
U.K Plan | Alternative strategies |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total asset allocation | 14.70% | 13.00%
U.K Plan | Cash, cash equivalents and short-term investment funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total asset allocation | 0.90% | 0.80%

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- Definition Percentage of actual 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/2009/role/commonPracticeRef -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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