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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