Earnings per Share - Earnings per Share Reconciliation (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Basic net earnings (loss) per share attributable to RRD common stockholders (Note 11):
Continuing Operations	$ 0.39	$ (0.13)	$ 0.23	$ (0.83)
Discontinued Operations		0.01	0.01	(0.27)
Net earnings (loss) attributable to RR Donnelley stockholders	0.39	(0.12)	0.24	(1.10)
Diluted net earnings (loss) per share attributable to RRD common stockholders (Note 11):
Continuing Operations	0.38	(0.13)	0.23	(0.83)
Discontinued Operations		0.01	0.01	(0.27)
Net earnings (loss) attributable to RR Donnelley stockholders	$ 0.38	$ (0.12)	$ 0.24	$ (1.10)
Net earnings (loss) attributable to RRD common stockholders - continuing operations	$ 28.3	$ (9.3)	$ 17.0	$ (59.6)
Net earnings (loss) from discontinued operations, net of income taxes		0.4	0.6	(19.5)
Net income (loss) attributable to RRD common stockholders	$ 28.3	$ (8.9)	$ 17.6	$ (79.1)
Basic weighted average number of common shares outstanding	73.4	72.4	73.1	72.1
Dilutive options and awards	0.7		0.9
Diluted weighted average number of common shares outstanding	74.1	72.4	74.0	72.1
Weighted average number of anti-dilutive share-based awards:
Weighted average antidilutive securities excluded from computation of earnings per share	0.2	1.8	0.2	1.4
Dividends declared per common share				$ 0.03
Stock options
Weighted average number of anti-dilutive share-based awards:
Weighted average antidilutive securities excluded from computation of earnings per share	0.2	0.3	0.2	0.3
Restricted stock units
Weighted average number of anti-dilutive share-based awards:
Weighted average antidilutive securities excluded from computation of earnings per share		1.5		1.1