Retirement and Other Postretirement Benefit Plans - Additional Information (Details) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Defined Benefit Retirement Plans
Amounts recognized on the balance sheet:
Amounts unrelated to service costs, benefit	$ 800,000	$ 1,100,000
Defined Benefit Retirement Plans | U.S.
Amounts recognized on the balance sheet:
Employer contribution to defined benefit retirement plans	200,000	$ 100,000
Expected employer contribution in full current year	$ 900,000
Defined Benefit Plan, Tax Status [Extensible List]	us-gaap:NonqualifiedPlanMember	us-gaap:NonqualifiedPlanMember	us-gaap:NonqualifiedPlanMember
Defined Benefit Retirement Plans | European
Amounts recognized on the balance sheet:
Employer contribution to defined benefit retirement plans	$ 1,200,000	$ 1,600,000
Expected employer contribution in full current year	5,000,000
Net amortization gain deferral	(100,000)	(100,000)
Postretirement Health Care and Life Insurance Benefit Plans
Amounts recognized on the balance sheet:
Net amortization gain deferral	300,000	$ 300,000
Postretirement Health Care and Life Insurance Benefit Plans | Maximum
Amounts recognized on the balance sheet:
Expected employer contribution in full current year	$ 500,000