Retirement and Other Postretirement Benefit Plans - Additional Information (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Defined Benefit Retirement Plans
Amounts recognized on the balance sheet:
Amounts unrelated to service costs, benefit	$ 100,000	$ 600,000	$ 300,000	$ 1,100,000
Defined Benefit Retirement Plans | U.S.
Amounts recognized on the balance sheet:
Employer contribution to defined benefit retirement plans			300,000	$ 300,000
Expected employer contribution in full current year	$ 3,400,000		$ 3,400,000
Defined Benefit Plan, Tax Status [Extensible List]	Non-qualified	Non-qualified	Non-qualified	Non-qualified	Non-qualified
Net amortization gain deferral	$ (200,000)	$ (100,000)	$ (400,000)	$ (200,000)
Defined Benefit Retirement Plans | European
Amounts recognized on the balance sheet:
Employer contribution to defined benefit retirement plans			2,200,000	1,900,000
Expected employer contribution in full current year	5,600,000		5,600,000
Net amortization gain deferral	(200,000)	(100,000)	(500,000)	(200,000)
Postretirement Health Care and Life Insurance Benefit Plans
Amounts recognized on the balance sheet:
Net amortization gain deferral	200,000	$ 200,000	400,000	$ 400,000
Postretirement Health Care and Life Insurance Benefit Plans | Maximum
Amounts recognized on the balance sheet:
Expected employer contribution in full current year	$ 400,000		$ 400,000