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Goodwill and Other Intangible Assets (Narrative) (Details) - USD ($)	3 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Goodwill [Line Items]
Goodwill impairment		$ 0	$ 0	$ 0
Goodwill		103,000,000.0	44,500,000	0
Finite-lived intangible assets acquired		69,800,000
Impairment of intangible assets		0	0	0
Amortization expense for other intangible assets		44,800,000	$ 34,400,000	$ 18,300,000
United States Book Business \| Discontinued Operations, Held-for-sale
Goodwill [Line Items]
Goodwill impairment	$ 10,100,000
Core Print And Related Services
Goodwill [Line Items]
Goodwill impairment		0
Goodwill		$ 103,000,000.0