Acquisitions and Dispositions - Pro Forma Financial Information (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Business Combinations [Abstract]
Net sales	$ 2,800.0	$ 2,970.2	$ 5,606.7	$ 5,857.3
Net earnings attributable to RR Donnelley common shareholders	$ 62.1	$ 76.3	$ 95.5	$ 36.5
Net earnings per share attributable to RR Donnelley common shareholders:
Basic	$ 0.30	$ 0.37	$ 0.46	$ 0.18
Diluted	$ 0.30	$ 0.36	$ 0.45	$ 0.17

The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (h)(2)-(3)

-URI http://asc.fasb.org/extlink&oid=56956515&loc=d3e1392-128463

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The pro forma diluted net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

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The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

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The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.

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