Acquisitions and Dispositions - Schedule of Purchase Price Allocation for Acquisitions (Detail) - USD ($) $ in Millions			12 Months Ended
	Aug. 04, 2016	Jan. 31, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Business Acquisition [Line Items]
Goodwill			$ 602.0	$ 1,085.7	$ 1,099.2
Less: gain on bargain purchase					9.5
Net cash paid			$ 48.1	118.2	$ 380.8
Precision Dialogue Holdings, LLC
Business Acquisition [Line Items]
Accounts receivable	$ 11.5
Inventories	0.4
Prepaid expenses and other current assets	0.8
Property, plant and equipment	6.9
Other intangible assets	14.1
Other noncurrent assets	1.2
Goodwill	42.5
Accounts payable and accrued liabilities	(11.4)
Deferred taxes-net	(6.8)
Total purchase price-net of cash acquired	59.2
Less: debt assumed	11.1
Net cash paid	$ 48.1
Four Insignificant Acquisitions
Business Acquisition [Line Items]
Accounts receivable				3.4
Inventories				0.2
Prepaid expenses and other current assets				0.6
Property, plant and equipment				5.7
Other intangible assets				5.2
Other noncurrent assets				0.2
Goodwill				15.2
Accounts payable and accrued liabilities				(5.6)
Other noncurrent liabilities				(4.7)
Total purchase price-net of cash acquired				20.2
Less: debt assumed				3.7
Less: settlement of accounts receivable for acquisition of a business				8.6
Less: value of common stock issued				1.0
Net cash paid				$ 6.9
Consolidated Graphics, Inc
Business Acquisition [Line Items]
Accounts receivable		$ 171.3
Inventories		65.9
Prepaid expenses and other current assets		15.4
Property, plant and equipment		297.0
Other intangible assets		179.3
Other noncurrent assets		10.4
Goodwill		296.6
Accounts payable and accrued liabilities		(159.5)
Other noncurrent liabilities		(41.5)
Deferred taxes-net		(116.6)
Total purchase price-net of cash acquired		718.3
Less: debt assumed		118.4
Less: value of common stock issued		300.7
Net cash paid		$ 299.2