Acquisitions and Dispositions - Schedule of Purchase Price Allocation for Acquisitions (Detail) - USD ($) $ in Millions			9 Months Ended
	Aug. 04, 2016	Jun. 08, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Business Acquisition [Line Items]
Goodwill			$ 1,787.3		$ 1,743.6
Net cash paid			$ 47.5	$ 118.3
Precision Dialogue Holdings, LLC
Business Acquisition [Line Items]
Accounts receivable	$ 11.8
Inventories	0.4
Prepaid expenses and other current assets	1.0
Property, plant and equipment	6.9
Other intangible assets	14.7
Other noncurrent assets	1.2
Goodwill	41.0
Accounts payable and accrued liabilities	(11.1)
Deferred taxes--net	(7.3)
Total purchase price-net of cash acquired	58.6
Less: debt assumed	11.1
Net cash paid	$ 47.5
Courier Corporation, 3 Insignificant Acquisitions
Business Acquisition [Line Items]
Accounts receivable		$ 36.2
Inventories		59.0
Prepaid expenses and other current assets		38.8
Property, plant and equipment		163.8
Other intangible assets		108.8
Other noncurrent assets		7.9
Goodwill		66.3
Accounts payable and accrued liabilities		(24.6)
Other noncurrent liabilities		(10.5)
Deferred taxes--net		(83.7)
Total purchase price-net of cash acquired		362.0
Less: debt assumed		80.2
Less: settlement of accounts receivable for acquisition of a business		8.6
Less: value of common stock issued		155.2
Net cash paid		$ 118.0