Asset Restructuring and Impairment Costs - Narrative (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)
Restructuring Cost and Reserve [Line Items]
Asset restructuring and impairment costs	$ 55,300,000	$ 2,000,000.0	$ 55,300,000	$ 2,000,000.0
Impairment losses	52,300,000	0	52,300,000	0
Impairment of indefinite lived intangible assets	0
Goodwill impairment	0
Accelerated depreciation charges from idled assets	2,600,000	2,000,000.0	2,600,000	2,000,000.0
Employee termination benefit costs	400,000	0	$ 400,000	0
Technical Products
Restructuring Cost and Reserve [Line Items]
Impairment losses	51,000,000.0
Impairment of intangible assets	400,000
Fine Paper and Packaging
Restructuring Cost and Reserve [Line Items]
Accelerated depreciation	3,000,000.0
Impairment of intangible assets	$ 900,000
Accelerated depreciation charges from idled assets		$ 2,000,000.0		$ 2,000,000
Risk Free Interest Rate | Technical Products
Restructuring Cost and Reserve [Line Items]
Long-lived asset measurement input	0.095		0.095
Fine Paper Machine
Restructuring Cost and Reserve [Line Items]
Accelerated depreciation charges from idled assets	$ 2,600,000