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Concentrations of Risk - Additional Information (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2018 USD ($) employee | Dec. 31, 2017 USD ($)
Concentration Risk [Line Items] |  |
Accounts receivable, net, current | $ 901.9 | $ 830.7
Number of employees of PCA | employee | 15,000 |
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 | 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 | $ 66.7 | $ 33.3
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 | 7.00% | 4.00%
Paper | Office Depot | Paper Segment Sales Revenue | Customer Concentration Risk |  |
Concentration Risk [Line Items] |  |
Concentration risk, percentage | 47.00% | 43.00%

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