Quarterly Financial Data - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended															12 Months Ended
	Dec. 31, 2015		Sep. 30, 2015		Jun. 30, 2015		Mar. 31, 2015		Dec. 31, 2014	Sep. 30, 2014		Jun. 30, 2014		Mar. 31, 2014		Dec. 31, 2015	Dec. 31, 2014		Dec. 31, 2013
Quarterly Financial Data [Line Items]
Net sales	$ 1,390.9		$ 1,470.8		$ 1,454.3		$ 1,425.7		$ 1,434.0	$ 1,518.9		$ 1,468.4		$ 1,431.3		$ 5,741.7	$ 5,852.6		$ 3,665.3
Gross profit	285.0		328.3		317.6		277.0		297.0	320.3		310.8		301.4		1,208.0	1,229.5		867.5
Operating Income (Loss)	(175.9)	[1]	(219.4)	[2]	(197.6)	[3]	(157.1)	[4]	(173.2)	(188.4)	[5]	(180.2)	[6]	(160.9)	[7]	(750.0)	(702.7)		(481.9)	[8]
Net income	$ 104.3	[1]	$ 127.8	[2]	$ 114.0	[3]	$ 90.8	[4]	$ 98.5	$ 104.4	[5]	$ 99.6	[6]	$ 90.1	[7]	$ 436.8	$ 392.6		$ 441.3
Basic income per common share	$ 1.07		$ 1.31		$ 1.16		$ 0.92		$ 1.00	$ 1.06		$ 1.01		$ 0.92		$ 4.47	$ 3.99		$ 4.57
Diluted income per common share	1.07	[1]	1.31	[2]	1.16	[3]	0.92	[4]	1.00	1.06	[5]	1.01	[6]	0.92	[7]	4.47	3.99		$ 4.52
Stock price - high	70.04		73.60		78.98		84.88		80.14	72.82		72.74		75.10		84.88	80.14
Stock price - low	$ 59.54		$ 58.29		$ 62.48		$ 73.03		$ 57.06	$ 63.11		$ 65.00		$ 61.35		$ 58.29	$ 57.06
Interest expense, net																$ (85.5)	$ (88.4)	[9]	$ (58.3)	[8],[10]
Income before taxes																$ 664.5	$ 614.3		$ 423.6	[8]
Correction of income statement classification					$ 6.0
Settled Litigation
Quarterly Financial Data [Line Items]
Operating Income (Loss)														$ 17.6
Decrease (Increase) in net income														$ (11.2)
Decrease (Increase) in net income per diluted share														$ (0.11)
DeRidder Restructuring Costs
Quarterly Financial Data [Line Items]
Operating Income (Loss)	$ (3.5)		$ (3.8)		(1.0)		$ 10.3		$ 18.0	$ 26.0		$ 17.8		$ 4.0
Decrease (Increase) in net income	$ 2.2		$ 2.3		$ 0.7		$ (6.6)		$ (11.7)	$ (16.6)		$ (11.2)		$ (2.6)
Decrease (Increase) in net income per diluted share	$ 0.02		$ 0.02		$ 0.01		$ (0.07)		$ (0.12)	$ (0.17)		$ (0.12)		$ (0.02)
Boise Inc. | Integration-Related and Other Costs
Quarterly Financial Data [Line Items]
Operating Income (Loss)	$ 3.8		$ 2.4		$ 3.7		$ 3.5		$ 6.4			$ 4.9		$ 4.1
Income before taxes										$ (4.5)
Decrease (Increase) in net income	$ (2.6)		$ (1.7)		$ (2.3)		$ (2.2)		$ (4.2)	$ (2.9)		$ (3.0)		$ (2.6)
Decrease (Increase) in net income per diluted share	$ (0.03)		$ (0.02)		$ (0.03)		$ (0.02)		$ (0.04)	$ (0.03)		$ (0.03)		$ (0.03)
Mill at St. Helens, Oregon [Member] | DeRidder Restructuring Costs
Quarterly Financial Data [Line Items]
Operating Income (Loss)			$ (6.7)
Decrease (Increase) in net income			$ 4.4
Decrease (Increase) in net income per diluted share			$ 0.05
Louisiana State | DeRidder Restructuring Costs
Quarterly Financial Data [Line Items]
Operating Income (Loss)							$ (3.6)

[1] Includes $3.5 million of income from DeRidder restructuring ($2.2 million after-tax or $0.02 per diluted share) and $3.8 million of integration-related and other costs ($2.6 million after-tax or $0.03 per diluted share).

[2] Includes $3.8 million of income from DeRidder restructuring ($2.3 million after-tax or $0.02 per diluted share) and $2.4 million of integration-related and other costs ($1.7 million after-tax or $0.02 per diluted share). Also includes $6.7 million gain from the sale of our paper mill site at St. Helens, Oregon ($4.4 million after tax or $0.05 per diluted share).

[3] Includes $1.0 million of income from DeRidder restructuring ($0.7 million after-tax or $0.01 per diluted share) and $3.7 million of integration-related and other costs ($2.3 million after-tax or $0.03 per diluted share). Gross profit has been revised to correct an error in the previous presentation totaling $6.0 million reclassified from "Selling, general, and administrative expenses" to "Cost of Sales" for the three months ended June 30, 2015.

[4] Includes $10.3 million of DeRidder restructuring charges ($6.6 million after-tax or $0.07 per diluted share) and $3.5 million of integration-related and other costs ($2.2 million after-tax or $0.02 per diluted share). Also includes a $3.6 million tax credit from the State of Louisiana related to our recent capital investment and the jobs retained at the DeRidder, Louisiana mill.

[5] Includes $26.0 million of DeRidder restructuring charges ($16.6 million after-tax or $0.17 per diluted share) and $4.5 million of integration-related and other costs ($2.9 million after-tax or $0.03 per diluted share).

[6] Includes $17.8 million of DeRidder restructuring charges ($11.2 million after-tax or $0.12 per diluted share) and $4.9 million of integration-related and other costs ($3.0 million after-tax or $0.03 per diluted share).

[7] Includes $17.6 million of costs accrued for the settlement of the Kleen Products LLC v Packaging Corp. of America et al class action lawsuit ($11.2 million after-tax or $0.11 per diluted share), $4.1 million of integration-related costs ($2.6 million after-tax or $0.03 per diluted share), and $4.0 million of DeRidder restructuring charges ($2.6 million after-tax or $0.02 per diluted share).

[8] On October 25, 2013, we acquired Boise Inc. (Boise). Our financial results include Boise subsequent to acquisition.

[9] Includes $1.5 million of expense related to the write-off of deferred financing costs in connection with the debt refinancing discussed in Note 10, Debt.

[10] Includes $10.5 million of expenses for financing the Boise acquisition and $1.1 million of expense for the write-off of deferred financing costs.