Goodwill and Intangible Assets -Goodwill - Additional Information (Details) - USD ($)		3 Months Ended	6 Months Ended	12 Months Ended
	May 31, 2020	Dec. 31, 2021	Jun. 30, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Goodwill [Line Items]
Goodwill impairment charge		$ 0		$ 0	$ 55,200,000	$ 0
Discount rate utilized	0.09
Goodwill		923,500,000		923,500,000	863,500,000	918,700,000
Packaging
Goodwill [Line Items]
Goodwill		923,500,000		923,500,000	863,500,000	863,500,000
Paper
Goodwill [Line Items]
Goodwill impairment charge					55,200,000
Goodwill		$ 0		$ 0	$ 0	$ 55,200,000
Recoverability Test Results Recoverable Percentage	100.00%
Paper Reporting Unit
Goodwill [Line Items]
Goodwill impairment charge	$ 55,200,000		$ 55,200,000