Pension and Other Postretirement Benefits - Houghton and Cash Flow Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Jan. 01, 2019
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Contributions by Employer	$ 9,214,000	$ 6,310,000
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Acquired pension balance	55,374,000	55,967,000
Defined Benefit Plans, Estimated Future Employer Contributions in Next Fiscal Year	10,000,000
Pension Plans, Defined Benefit [Member] | Cleveland Bakers and Teamsters Pension Fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Multiemployer Plan, Plan Liabilities	0		$ 589,000,000
Multiemployer Plans Plan Assets		364,000,000
Multiemployer Plans Plan Contributions	100,000
Other Postretirement Benefit Plans Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plans, Estimated Future Employer Contributions in Next Fiscal Year	$ 300,000
Other Current and Other Non-current Liabilities [Member] | Pension Plans, Defined Benefit [Member] | Cleveland Bakers and Teamsters Pension Fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Multiemployer Plans Collective Bargaining Arrangement Expiration Date	May 01, 2022
Domestic plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Contributions by Employer	$ 2,302,000	1,087,000
Domestic plan [Member] | Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Acquired pension balance	36,488,000	33,173,000
Defined Benefit Plans, Estimated Future Employer Contributions in Next Fiscal Year	5,900,000
Domestic plan [Member] | Other Postretirement Benefit Plans Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Acquired pension balance	3,234,000	4,266,000
Foreign Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Contributions by Employer	6,912,000	5,223,000
Foreign Plan [Member] | Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Acquired pension balance	18,886,000	22,794,000
Defined Benefit Plans, Estimated Future Employer Contributions in Next Fiscal Year	4,100,000
Foreign Plan [Member] | Other Postretirement Benefit Plans Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Contributions by Employer	$ 250,000	$ 384,000