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Income Taxes - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Taxes [Line Items] |  |  |  |  |  |
Federal corporate tax rate |  |  | 21.00% | 35.00% | 35.00% |
Maximum measurement period to finalize accounting of tax |  |  | 1 year |  |  |
Income tax benefit as result of Tax Act | $ 2.0 | $ 122.1 |  |  |  |
Re-measurement of deferred tax assets and liabilities due to enacted corporate tax rate |  |  |  | $ 128.0 |  |
Reduction in domestic manufacturers deductions |  |  |  | 5.1 |  |
Transition tax due to tax reform |  |  |  | 0.8 |  |
Cash payments for income taxes |  |  | $ 140.8 | 298.7 | $ 222.1 |
Gross reserve for unrecognized tax benefits, excluding interest and penalties | 4.6 | 4.8 | 4.6 | 4.8 | $ 5.2 | $ 5.8
Unrecognized tax benefits that would impact of effective tax rate | 4.0 |  | 4.0 |  |  |
Interest accrued related to unrecognized tax benefits and penalties | 1.1 | $ 1.1 | 1.1 | $ 1.1 |  |
Reasonably possible decrease in unrecognized tax benefits related to state apportionment issues in next 12 months | $ 3.1 |  | $ 3.1 |  |  |
Boise Inc. |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Open tax year |  |  | 2013 |  |  |
Boise Inc. | Earliest Tax Year |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Open tax year |  |  | 2008 |  |  |
Boise Inc. | Latest Tax Year |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Open tax year |  |  | 2011 |  |  |
Foreign |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Open tax year |  |  | 2009 |  |  |
State taxing jurisdiction | Earliest Tax Year |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Open tax year |  |  | 2014 |  |  |
State taxing jurisdiction | Latest Tax Year |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Open tax year |  |  | 2018 |  |  |
Internal Revenue Service (IRS) |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Income tax examination (description) |  |  | A federal examination of the 2013 tax year was concluded in November 2016. |  |  |
Internal Revenue Service (IRS) | Earliest Tax Year |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Open tax year |  |  | 2015 |  |  |
Internal Revenue Service (IRS) | Latest Tax Year |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Open tax year |  |  | 2018 |  |  |

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