Schedule of Purchase Price Allocation for Acquisitions (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Business Acquisition [Line Items]
Goodwill	$ 1,436.3	$ 1,436.4	$ 2,222.1
Presort, Meisel, XPO and EDGAR Online Acquisitions
Business Acquisition [Line Items]
Accounts receivable		18.3
Inventories		2.0
Prepaid expenses and other current assets		4.3
Property, plant and equipment		10.4
Amortizable other intangible assets		37.5
Other noncurrent assets		15.1
Goodwill		55.6
Accounts payable and accrued liabilities		(21.5)
Other noncurrent liabilities		(0.1)
Deferred taxes-net		10.4
Total purchase price-net of cash acquired		132.0
Less: debt assumed		1.4
Less: fair value of contingent consideration		3.5
Net cash paid		127.1
Stratus Genesis Libre Digital Sequence Helium And Journalism Online Acquisitions
Business Acquisition [Line Items]
Accounts receivable			6.0
Inventories			2.3
Prepaid expenses and other current assets			0.4
Property, plant and equipment and other noncurrent assets			16.8
Amortizable other intangible assets			16.2
Goodwill			117.6
Accounts payable and accrued liabilities			(8.2)
Other noncurrent liabilities			(2.9)
Deferred taxes-net			14.2
Total purchase price-net of cash acquired			162.4
Less: fair value of contingent consideration			6.8
Less: fair value of Company's previously-held investments in Helium			13.9
Net cash paid			$ 141.7