Revenue Recognition - Net Sales Disaggregated by Products and Services (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Disaggregation Of Revenue [Line Items]
Total net sales	$ 1,145.6	$ 1,009.6	$ 2,318.7	$ 2,226.5
Commercial Print
Disaggregation Of Revenue [Line Items]
Total net sales	340.3	275.5	676.8	638.9
Packaging
Disaggregation Of Revenue [Line Items]
Total net sales	179.7	150.4	354.1	265.5
Direct Marketing
Disaggregation Of Revenue [Line Items]
Total net sales	113.6	108.0	244.5	290.8
Labels
Disaggregation Of Revenue [Line Items]
Total net sales	131.3	113.7	260.0	235.3
Digital Print and Fulfillment
Disaggregation Of Revenue [Line Items]
Total net sales	101.7	84.7	199.2	198.3
Statements
Disaggregation Of Revenue [Line Items]
Total net sales	99.3	101.9	217.8	228.8
Supply Chain Management
Disaggregation Of Revenue [Line Items]
Total net sales	67.3	64.9	140.0	134.6
Forms
Disaggregation Of Revenue [Line Items]
Total net sales	48.8	48.6	97.6	101.0
Business Process Outsourcing
Disaggregation Of Revenue [Line Items]
Total net sales	42.9	40.6	85.4	84.6
Digital and Creative Solutions
Disaggregation Of Revenue [Line Items]
Total net sales	$ 20.7	$ 21.3	$ 43.3	$ 48.7