The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income.

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Income Taxes - Additional Information (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash payments for income taxes	$ 189.5us-gaap_IncomeTaxesPaid	$ 90.7us-gaap_IncomeTaxesPaid	$ 9.7us-gaap_IncomeTaxesPaid
Federal
Income tax examination (description)	A federal examination of the tax years 2008 and 2009 was concluded in November 2013, and tax years 2010 - 2012 were concluded in February 2015.
Foreign
Open tax year	2008
Minimum \| Federal
Open tax year	2013
Minimum \| State
Open tax year	2010
Minimum \| Boise Inc.
Open tax year	2008
Maximum \| Federal
Open tax year	2014
Maximum \| State
Open tax year	2014
Maximum \| Boise Inc.
Open tax year	2013