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Goodwill and Other Intangible Assets (Schedule of Goodwill) (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Goodwill [Line Items]    
Goodwill, Gross $ 911.3  
Accumulated goodwill impairment loss (808.3)  
Goodwill 103.0 $ 103.0
United States Print and Related Services    
Goodwill [Line Items]    
Goodwill, Gross 881.3  
Accumulated goodwill impairment loss (778.3)  
Goodwill 103.0  
International    
Goodwill [Line Items]    
Goodwill, Gross 30.0  
Accumulated goodwill impairment loss (30.0)  
Goodwill $ 0.0