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Property, Plant, and Equipment - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020 | May 31, 2020
Depreciation [Abstract] |  |  |  |  |  |
Depreciation expense | $ 94.5 | $ 93.3 | $ 184.5 | $ 183.1 |  |
Incremental depreciation |  |  | 2.1 | $ 2.6 |  |
Purchases of property, plant, and equipment included in accounts payable |  |  | $ 41.4 |  | $ 20.4 |
Paper |  |  |  |  |  |
Property, Plant, And Equipment [Line Items] |  |  |  |  |  |
Recoverability test results recoverable percentage |  |  |  |  |  | 100.00%

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