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Benefit Plans - Percentage of Fair Value of Pension Plan Assets (Details) - Pension Plans | Dec. 31, 2020 | Dec. 31, 2019
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U.S. Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Percentage of fair value pension plan assets | 100.00% | 100.00%
U.S. Plans | Equity securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Percentage of fair value pension plan assets | 15.00% | 15.00%
U.S. Plans | Fixed-income securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Percentage of fair value pension plan assets | 85.00% | 85.00%
U.S. Plans | Real estate |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Percentage of fair value pension plan assets | 0.00% | 0.00%
U.S. Plans | Hedge funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Percentage of fair value pension plan assets | 0.00% | 0.00%
U.S. Plans | Buy-in annuity policies |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Percentage of fair value pension plan assets | 0.00% | 0.00%
U.S. Plans | Cash |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Percentage of fair value pension plan assets | 0.00% | 0.00%
Non-U.S. Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Percentage of fair value pension plan assets | 100.00% | 100.00%
Non-U.S. Plans | Equity securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Percentage of fair value pension plan assets | 23.00% | 26.00%
Non-U.S. Plans | Fixed-income securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Percentage of fair value pension plan assets | 58.00% | 54.00%
Non-U.S. Plans | Real estate |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Percentage of fair value pension plan assets | 5.00% | 6.00%
Non-U.S. Plans | Hedge funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Percentage of fair value pension plan assets | 2.00% | 1.00%
Non-U.S. Plans | Buy-in annuity policies |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Percentage of fair value pension plan assets | 11.00% | 12.00%
Non-U.S. Plans | Cash |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Percentage of fair value pension plan assets | 1.00% | 1.00%

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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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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