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Income Taxes - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Taxes [Line Items] |  |  |  |
Cash payments for income taxes | $ 115.6 | $ 172.7 | $ 140.8 |
Gross reserve for unrecognized tax benefits, excluding interest and penalties | 5.2 | 4.8 | $ 4.6 | $ 4.8
Unrecognized tax benefits that would impact of effective tax rate | 4.6 |  |  |
Interest accrued related to unrecognized tax benefits and penalties | 1.2 | $ 1.2 |  |
Reasonably possible decrease in unrecognized tax benefits related to state apportionment issues in next 12 months | $ 3.1 |  |  |
Boise Inc. |  |  |  |
Income Taxes [Line Items] |  |  |  |
Open tax year | 2008 2009 2010 2011 2012 2013 |  |  |
Non U.S. taxing jurisdiction |  |  |  |
Income Taxes [Line Items] |  |  |  |
Open tax year | 2009 |  |  |
State taxing jurisdiction |  |  |  |
Income Taxes [Line Items] |  |  |  |
Open tax year | 2016 2017 2018 2019 2020 |  |  |
Internal Revenue Service (IRS) |  |  |  |
Income Taxes [Line Items] |  |  |  |
Income tax examination (description) | A federal examination of the 2016 tax year commenced in April 2019. |  |  |
Open tax year | 2016 2017 2018 2019 2020 |  |  |

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- Definition A brief description of status of the tax examination, significant findings to date, and the entity's position with respect to the findings. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details
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- Definition The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4297-108586 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3536-108585 + Details
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