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Disposition - Narrative (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Sep. 30, 2018
Jul. 02, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Proceeds from sale of business     $ 50.5  
Disposition by Sale | Business Services | Print Logistics        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Cash on disposition of business       $ 60.0
Proceeds from sale of business   $ 55.1    
Cash included in disposition   4.9 4.9  
Pre-tax gain resulted from disposition of business   $ 4.5 $ 4.5  
Disposition by Sale | Business Services | Print Logistics | Scenario Forecast        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Final working capital adjustment $ 6.9