Schedule of Purchase Price Allocation for Acquisitions (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012 Presort, Meisel, XPO and EDGAR Online acquisitions	Dec. 31, 2011 Stratus Genesis Libre Digital Sequence Helium And Journalism Online Acquisitions	Dec. 31, 2010 Bowne Nimblefish And Eight Touches
Business Acquisition [Line Items]
Accounts receivable	$ 18.7	$ 6.0	$ 129.0
Inventories	1.4	2.3	32.1
Prepaid expenses and other current assets	4.6	0.4	18.1
Property, plant and equipment	8.3
Property, plant and equipment and other noncurrent assets		16.8	127.3
Amortizable other intangible assets	36.4	16.2	159.8
Other noncurrent assets	15.1
Goodwill	57.9	117.6	257.9
Accounts payable and accrued liabilities	(20.2)	(8.2)	(159.7)
Other noncurrent liabilities	(0.1)	(2.9)
Pension benefits and other noncurrent liabilities			(76.7)
Deferred taxes-net	10.4	14.2	(17.6)
Total purchase price-net of cash acquired	132.5	162.4	470.2
Less: debt assumed	1.4		28.2
Less: fair value of Company's previously-held investments in Helium		13.9
Less: fair value of contingent consideration	3.5	6.8
Net cash paid	$ 127.6	$ 141.7	$ 442.0