Revenue Recognition - Net Sales Disaggregated by Products and Services (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disaggregation Of Revenue [Line Items]
Total net sales	$ 4,766.3	$ 5,473.2	$ 5,702.4
Commercial Print
Disaggregation Of Revenue [Line Items]
Total net sales	1,357.7	1,694.5	1,935.6
Direct Marketing
Disaggregation Of Revenue [Line Items]
Total net sales	555.4	676.7	581.6
Packaging
Disaggregation Of Revenue [Line Items]
Total net sales	687.6	668.5	672.0
Statements
Disaggregation Of Revenue [Line Items]
Total net sales	441.6	545.4	584.2
Labels
Disaggregation Of Revenue [Line Items]
Total net sales	496.6	497.4	481.4
Digital Print and Fulfillment
Disaggregation Of Revenue [Line Items]
Total net sales	425.7	492.1	474.4
Supply Chain Management
Disaggregation Of Revenue [Line Items]
Total net sales	329.9	298.7	321.0
Forms
Disaggregation Of Revenue [Line Items]
Total net sales	202.4	244.3	267.5
Business Process Outsourcing
Disaggregation Of Revenue [Line Items]
Total net sales	169.4	243.9	259.6
Digital and Creative Solutions
Disaggregation Of Revenue [Line Items]
Total net sales	$ 100.0	$ 111.7	$ 125.1