Revenue Recognition (Disaggregation of Revenue) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	$ 705.8	$ 822.5
Catalog, publications, retail inserts, books and directories
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	378.7	476.8
Direct mail and other printed products
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	145.8	166.8
Other
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	1.5	1.4
Total Products
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	526.0	645.0
Logistics services
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	97.8	94.4
Imaging, marketing services and other services
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	82.0	83.1
Total Services
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	179.8	177.5
United States Print and Related Services
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	634.6	736.6
United States Print and Related Services | Catalog, publications, retail inserts, books and directories
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	329.7	412.1
United States Print and Related Services | Direct mail and other printed products
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	129.0	150.4
United States Print and Related Services | Other
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	1.2	1.1
United States Print and Related Services | Total Products
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	459.9	563.6
United States Print and Related Services | Logistics services
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	92.7	90.0
United States Print and Related Services | Imaging, marketing services and other services
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	82.0	83.0
United States Print and Related Services | Total Services
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	174.7	173.0
International
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	71.2	85.9
International | Catalog, publications, retail inserts, books and directories
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	49.0	64.7
International | Direct mail and other printed products
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	16.8	16.4
International | Other
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0.3	0.3
International | Total Products
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	66.1	81.4
International | Logistics services
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	5.1	4.4
International | Imaging, marketing services and other services
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0.0	0.1
International | Total Services
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	$ 5.1	$ 4.5