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Pension Benefits - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items] |  |
Period of service to become eligible | 6 months |
Defined Benefit Plan, Accumulated Benefit Obligation | $ 3.7 | $ 2.9
Subsidiaries [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension expense | $ 0.8 | $ 0.3

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- Definition The period of service by substantially all of its U.S. employees to become eligible for the U.S. Defined Contribution Pension Plan. + References No definition available. + Details
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- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + 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 (e) -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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- Definition Amount of cost (reversal of cost) for pension benefits. Excludes other postretirement benefits. + References No definition available. + Details
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- Details
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