Pension Benefits and Other Postretirement Benefits (Additional Information) (Details)	3 Months Ended
	Jun. 30, 2021 USD ($)	Mar. 31, 2021 USD ($) plan	Mar. 31, 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		$ 5,486,000		$ 5,278,000
Rogers Employee Savings and Investment Plan (RESIP)
Defined Benefit Plan Disclosure [Line Items]
Expense recognized related to pension surplus investment balance that will be used to pay discretionary contribution to RESIP eligible employees		900,000
Rogers Employee Savings and Investment Plan (RESIP) | Forecast
Defined Benefit Plan Disclosure [Line Items]
Discretionary contributions paid to RESIP eligible employees	$ 900,000
Pension Benefits | Merged Plan and Rogers Employee Savings and Investment Plan (RESIP)
Defined Benefit Plan Disclosure [Line Items]
Pension surplus investment balance		8,800,000
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