Acquisitions and Dispositions - Schedule of Purchase Price Allocation for Acquisitions (Detail) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2014	Dec. 31, 2014	Sep. 30, 2015	Jun. 08, 2015
Business Acquisition [Line Items]
Goodwill		$ 1,706.6	$ 1,737.8
Less: gain on bargain purchase	$ 9.5
Courier Corporation
Business Acquisition [Line Items]
Accounts receivable			34.1
Inventories			59.0
Prepaid expenses and other current assets			38.7
Property, plant and equipment			162.2
Other intangible assets			106.5
Other noncurrent assets			7.9
Goodwill			58.3
Accounts payable and accrued liabilities			(21.4)
Other noncurrent liabilities			(10.5)
Deferred taxes—net			(83.6)
Total purchase price-net of cash acquired			351.2
Less: debt assumed			78.9	$ 78.2
Less: value of common stock issued			154.2
Net cash paid			$ 118.1
Consolidated Graphics, Esselte and MultiCorpora
Business Acquisition [Line Items]
Accounts receivable		242.0
Inventories		89.6
Prepaid expenses and other current assets		17.5
Property, plant and equipment		337.0
Other intangible assets		205.0
Other noncurrent assets		11.9
Goodwill		300.1
Accounts payable and accrued liabilities		(221.0)
Other noncurrent liabilities		(57.5)
Deferred taxes—net		(96.6)
Total purchase price-net of cash acquired		828.0
Less: debt assumed		118.4
Less: value of common stock issued		319.0
Less: gain on bargain purchase		9.5
Net cash paid		$ 381.1