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Goodwill and Other Intangible Assets - Narrative (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Schedule Of Other Intangible Assets [Line Items]        
Reduced in goodwill     $ 32.4  
Amortization expense for other intangible assets $ 6.8 $ 7.1 20.7 $ 21.6
Business Services        
Schedule Of Other Intangible Assets [Line Items]        
Reduced in goodwill     $ 32.4  
Disposition by Sale | Business Services | Print Logistics        
Schedule Of Other Intangible Assets [Line Items]        
Reduced in goodwill $ 32.4