Segment Information (Summary of Segment Information) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Products	$ 3,923,400,000	$ 3,985,800,000	$ 3,951,200,000
Operating Income (Loss)	34,700,000	87,300,000	172,800,000
Depreciation and Amortization	209,500,000	214,900,000	218,500,000
Capital Expenditures	111,000,000.0	96,300,000	85,900,000
Restructuring, impairment and transaction-related charges	89,400,000	103,300,000	59,900,000
Goodwill impairment	0	0	0
United States Print and Related Services
Segment Reporting Information [Line Items]
Products	3,521,000,000.0	3,598,700,000	3,559,900,000
Operating Income (Loss)	130,100,000	183,300,000	211,800,000
Depreciation and Amortization	188,100,000	193,200,000	196,800,000
Capital Expenditures	104,600,000	69,300,000	73,300,000
Restructuring, impairment and transaction-related charges	24,600,000	37,500,000	53,100,000
International
Segment Reporting Information [Line Items]
Products	402,400,000	387,100,000	391,300,000
Operating Income (Loss)	8,600,000	1,500,000	19,600,000
Depreciation and Amortization	20,100,000	20,800,000	21,000,000.0
Capital Expenditures	6,400,000	27,000,000.0	12,600,000
Restructuring, impairment and transaction-related charges	10,000,000.0	22,200,000	3,300,000
Operating Segments
Segment Reporting Information [Line Items]
Operating Income (Loss)	138,700,000	184,800,000	231,400,000
Depreciation and Amortization	208,200,000	214,000,000.0	217,800,000
Capital Expenditures	111,000,000.0	96,300,000	85,900,000
Restructuring, impairment and transaction-related charges	34,600,000	59,700,000	56,400,000
Corporate
Segment Reporting Information [Line Items]
Operating Income (Loss)	(104,000,000.0)	(97,500,000)	(58,600,000)
Depreciation and Amortization	1,300,000	900,000	700,000
Capital Expenditures	0	0	0
Restructuring, impairment and transaction-related charges	54,800,000	43,600,000	3,500,000
Product
Segment Reporting Information [Line Items]
Products	3,098,300,000	3,184,400,000	3,348,800,000
Product | United States Print and Related Services
Segment Reporting Information [Line Items]
Products	2,713,300,000	2,815,900,000	2,976,700,000
Product | International
Segment Reporting Information [Line Items]
Products	385,000,000.0	368,500,000	372,100,000
Product | Operating Segments
Segment Reporting Information [Line Items]
Products	3,098,300,000	3,184,400,000	3,348,800,000
Product | Corporate
Segment Reporting Information [Line Items]
Products	0	0	0
Service
Segment Reporting Information [Line Items]
Products	825,100,000	801,400,000	602,400,000
Service | United States Print and Related Services
Segment Reporting Information [Line Items]
Products	807,700,000	782,800,000	583,200,000
Service | International
Segment Reporting Information [Line Items]
Products	17,400,000	18,600,000	19,200,000
Service | Operating Segments
Segment Reporting Information [Line Items]
Products	825,100,000	801,400,000	602,400,000
Service | Corporate
Segment Reporting Information [Line Items]
Products	$ 0	$ 0	$ 0