Revenue Recognition - Net Sales Disaggregated by Products and Services (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Disaggregation Of Revenue [Line Items]
Total net sales	$ 1,173.1	$ 1,216.9
Commercial Print
Disaggregation Of Revenue [Line Items]
Total net sales	336.5	363.4
Packaging
Disaggregation Of Revenue [Line Items]
Total net sales	174.4	115.1
Direct Marketing
Disaggregation Of Revenue [Line Items]
Total net sales	130.9	182.8
Labels
Disaggregation Of Revenue [Line Items]
Total net sales	128.7	121.6
Digital Print and Fulfillment
Disaggregation Of Revenue [Line Items]
Total net sales	97.5	113.6
Statements
Disaggregation Of Revenue [Line Items]
Total net sales	118.5	126.9
Supply Chain Management
Disaggregation Of Revenue [Line Items]
Total net sales	72.7	69.7
Forms
Disaggregation Of Revenue [Line Items]
Total net sales	48.8	52.4
Business Process Outsourcing
Disaggregation Of Revenue [Line Items]
Total net sales	42.5	44.0
Digital and Creative Solutions
Disaggregation Of Revenue [Line Items]
Total net sales	$ 22.6	$ 27.4