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Concentrations of Risk - Additional Information (Details) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Concentration Risk [Line Items] |  |  |
Accounts receivable, net, current | $ 932.3 |  | $ 901.9
Office Depot | Credit Concentration Risk |  |  |
Concentration Risk [Line Items] |  |  |
Accounts receivable, net, current | $ 78.5 |  | $ 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 | 8.00% |  | 7.00%
Paper | Office Depot | Paper Segment Sales Revenue | Customer Concentration Risk |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, percentage | 50.00% | 46.00% | 47.00%

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