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v3.21.2

Pension Benefits and Other Postretirement Benefits (Additional Information) (Details) | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2021 USD ($) plan | Jun. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) | Jul. 27, 2020 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Number of qualified noncontributory defined benefit plans | plan | 1 |  |  |
Pension surplus investment balance | $ 5,694,000 |  | $ 5,278,000 |
Pension Benefits | Merged Plan and Rogers Employee Savings and Investment Plan (RESIP) |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Pension surplus investment balance | 7,700,000 |  |  |
Pension Benefits | Merged Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Pension surplus investment balance | 9,700,000 |  |  |
Contributions | 0 | $ 0 |  |
Pension Benefits | Rogers Employee Savings and Investment Plan (RESIP) | Suspense Account Held Within a Trust |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Plan assets |  |  |  | $ 7,400,000
Pension Benefits | Union Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Contributions | 0 | $ 0 |  |
Additional contributions required to make for remainder of fiscal year | $ 0 |  |  |

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