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Property, Plant, and Equipment - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020 | May 31, 2020
Depreciation [Abstract] |  |  |  |  |  |
Depreciation expense | $ 95.5 | $ 89.6 | $ 279.9 | $ 272.7 |  |
Incremental depreciation |  |  | 3.6 | $ 2.9 |  |
Purchases of property, plant, and equipment included in accounts payable |  |  | $ 112.1 |  | $ 22.2 |
Paper |  |  |  |  |  |
Property, Plant, And Equipment [Line Items] |  |  |  |  |  |
Recoverability test results recoverable percentage |  |  |  |  |  | 100.00%

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- Definition Future cash outflow to pay for purchases of fixed assets that have occurred. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=123431023&loc=d3e4332-108586 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=123431023&loc=d3e4313-108586 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=123431023&loc=d3e4304-108586 + Details
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