Concentrations of Risk - Additional Information (Details) $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($) employee	Dec. 31, 2018 USD ($)
Concentration Risk [Line Items]
Accounts receivable, net, current	$ 845.6	$ 901.9
Number of employees of PCA | employee	15,500
Percentage of hourly employees represented by unions	63.00%
Workforce Subject to Collective Bargaining Arrangements | Customer Concentration Risk
Concentration Risk [Line Items]
Concentration risk, percentage	45.00%
Workforce Subject to Collective Bargaining Arrangements Expiring within One Year | Customer Concentration Risk
Concentration Risk [Line Items]
Concentration risk, percentage	9.00%
Office Depot | Credit Concentration Risk
Concentration Risk [Line Items]
Accounts receivable, net, current	$ 76.2	$ 66.7
Office Depot | Total Company Sales Revenue | Customer Concentration Risk
Concentration Risk [Line Items]
Concentration risk, percentage	7.00%	7.00%
Office Depot | Total Company Receivables | Customer Concentration Risk
Concentration Risk [Line Items]
Concentration risk, percentage	9.00%	7.00%
Paper | Office Depot | Paper Segment Sales Revenue | Customer Concentration Risk
Concentration Risk [Line Items]
Concentration risk, percentage	50.00%	47.00%