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Inventories - Inventories (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Inventory [Line Items] |  |  |  |  |
Logs, pulpwood, chips and sawdust | $ 14.0 |  | $ 14.0 |  | $ 17.2
Inventory Pulp | 18.2 |  | 18.2 |  | 11.5
Pulp, paperboard and tissue products | 155.1 |  | 155.1 |  | 137.0
Materials and supplies | 95.6 |  | 95.6 |  | 97.7
Inventories | 282.9 |  | 282.9 |  | $ 263.3
Pension Plan [Member] |  |  |  |  |
Inventory [Line Items] |  |  |  |  |
Defined Benefit Plan, Amortization of Gain (Loss) | $ 2.6 | $ 2.5 | $ 5.1 | $ 5.0 |

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