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Pension Benefits and Postretirement Benefits Other Than Pensions - Narrative (Details)	3 Months Ended
	Mar. 31, 2021 employees
Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Number of participants and beneficiaries	3,175
Percentage of Compensation, Defined Benefit Plan Employee Contribution	3.00%
Postretirement Benefits Other than Pensions
Defined Benefit Plan Disclosure [Line Items]
Number of retired employees covered	575
Number of active employees covered	500

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- Definition

Defined Benefit Pension Plan, Number of Participants and Beneficiaries

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- Definition

Other Postretirement Benefit Plan, Number of Active Employees Covered

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- Definition

Other Postretirement Benefit Plan, Number of Retired Employees Covered

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- Definition

Percentage of Compensation, Defined Benefit Plan Employee Contribution

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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.

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No definition available.

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