Segment Information (Summary of Segment Information) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Products	$ 2,957,700,000	$ 3,217,000,000
Operating Income (Loss)	25,700,000	53,500,000
Depreciation and Amortization	128,800,000	141,300,000
Capital Expenditures	70,800,000	60,300,000
Restructuring, impairment and transaction-related charges	77,500,000	44,800,000
Goodwill impairment	0	0
Operating Segments
Segment Reporting Information [Line Items]
Operating Income (Loss)	74,900,000	103,800,000
Depreciation and Amortization	128,500,000	140,800,000
Capital Expenditures	70,800,000	60,300,000
Restructuring, impairment and transaction-related charges	75,900,000	42,800,000
Corporate
Segment Reporting Information [Line Items]
Operating Income (Loss)	(49,200,000)	(50,300,000)
Depreciation and Amortization	300,000	500,000
Capital Expenditures	0	0
Restructuring, impairment and transaction-related charges	1,600,000	2,000,000.0
United States Print and Related Services
Segment Reporting Information [Line Items]
Products	2,554,300,000	2,794,700,000
United States Print and Related Services | Operating Segments
Segment Reporting Information [Line Items]
Operating Income (Loss)	56,600,000	108,300,000
Depreciation and Amortization	113,700,000	124,700,000
Capital Expenditures	57,600,000	46,400,000
Restructuring, impairment and transaction-related charges	66,300,000	12,100,000
International
Segment Reporting Information [Line Items]
Products	403,400,000	422,300,000
International | Operating Segments
Segment Reporting Information [Line Items]
Operating Income (Loss)	18,300,000	(4,500,000)
Depreciation and Amortization	14,800,000	16,100,000
Capital Expenditures	13,200,000	13,900,000
Restructuring, impairment and transaction-related charges	9,600,000	30,700,000
Product
Segment Reporting Information [Line Items]
Products	2,334,100,000	2,528,300,000
Product | Operating Segments
Segment Reporting Information [Line Items]
Products	2,334,100,000	2,528,300,000
Product | Corporate
Segment Reporting Information [Line Items]
Products	0	0
Product | United States Print and Related Services | Operating Segments
Segment Reporting Information [Line Items]
Products	1,949,700,000	2,126,600,000
Product | International | Operating Segments
Segment Reporting Information [Line Items]
Products	384,400,000	401,700,000
Service
Segment Reporting Information [Line Items]
Products	623,600,000	688,700,000
Service | Operating Segments
Segment Reporting Information [Line Items]
Products	623,600,000	688,700,000
Service | Corporate
Segment Reporting Information [Line Items]
Products	0	0
Service | United States Print and Related Services | Operating Segments
Segment Reporting Information [Line Items]
Products	604,600,000	668,100,000
Service | International | Operating Segments
Segment Reporting Information [Line Items]
Products	$ 19,000,000.0	$ 20,600,000