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Benefit Plan Schedule of assumptions used to determine benefit obligations (Details) | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
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Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate | 3.00% | 3.53% | 4.60%
Rate of compensation increase |  |  |
Under age 30 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Rate of compensation increase | 8.25% | 10.00% | 10.00%
Ages 30-39 [Member] [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Rate of compensation increase | 6.00% | 6.00% | 6.00%
Ages 40-49 [Domain] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Rate of compensation increase | 5.00% | 4.00% | 4.00%
Ages 50 to 54 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Rate of compensation increase | 4.25% | 3.00% | 3.00%
Ages 55-59 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Rate of compensation increase | 3.75% | 3.00% | 3.00%
Ages 60-64 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Rate of compensation increase | 3.50% | 3.00% | 3.00%
Ages 65 and over |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Rate of compensation increase | 3.25% | 3.00% | 3.00%

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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 + Details
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- Definition Weighted average rate increase of compensation, used to determine benefit obligation of defined benefit plan. Plan includes, but is not limited to, pay-related 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)(2) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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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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