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Concentrations of Risk - Additional Information (Details) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($) employee	Dec. 31, 2019 USD ($)
Concentration Risk [Line Items]
Accounts receivable, net, current	$ 832.4	$ 845.6
Number of employees of PCA | employee	15,200
Percentage of hourly employees represented by unions	62.00%
Workforce Subject to Collective Bargaining Arrangements | Customer Concentration Risk
Concentration Risk [Line Items]
Concentration risk, percentage	44.00%
Workforce Subject to Collective Bargaining Arrangements Expiring within One Year | Customer Concentration Risk
Concentration Risk [Line Items]
Concentration risk, percentage	11.00%
Office Depot | Credit Concentration Risk
Concentration Risk [Line Items]
Accounts receivable, net, current	$ 39.6	$ 76.2
Office Depot | Total Company Sales Revenue | Customer Concentration Risk
Concentration Risk [Line Items]
Concentration risk, percentage	5.00%	7.00%
Office Depot | Total Company Receivables | Customer Concentration Risk
Concentration Risk [Line Items]
Concentration risk, percentage	5.00%	9.00%
Paper | Office Depot | Paper Segment Sales Revenue | Customer Concentration Risk
Concentration Risk [Line Items]
Concentration risk, percentage	45.00%	50.00%

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