Dispositions - Narrative (Detail) - USD ($) $ in Millions		9 Months Ended	12 Months Ended
	Oct. 25, 2019	Sep. 30, 2020	Dec. 31, 2019	May 08, 2019
RRD Brazil
Dispositions [Line Items]
Gain (loss) on disposition of business			$ 4.0
Disposition by Sale | GDS
Dispositions [Line Items]
Cash on disposition of business	$ 53.7
Gain (loss) on disposition of business	$ (3.8)
Disposition by Sale | Business Services
Dispositions [Line Items]
Cash on disposition of business				$ 11.6
Gain (loss) on disposition of business			$ 6.1
Disposition by Sale | Business Services | Logistics Courier
Dispositions [Line Items]
Cash on disposition of business		$ 10.4
Gain (loss) on disposition of business		$ (9.1)