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, 2015
Business Combinations [Abstract]
Net sales	$ 2,810.8	$ 5,617.5
Net earnings attributable to RR Donnelley common shareholders	$ 61.8	$ 95.2
Net earnings per share attributable to RR Donnelley common shareholders:
Basic	$ 0.30	$ 0.46
Diluted	$ 0.29	$ 0.45
Amortization of purchased intangibles	$ 21.2	$ 42.6
Restructuring, impairment and other charges	$ 11.1	$ 28.3