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Acquisitions (Narrative) (Details)
€ in Millions, $ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Jan. 31, 2017
USD ($)
Jan. 31, 2017
EUR (€)
Jan. 31, 2018
USD ($)
Mar. 31, 2018
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
Jan. 31, 2017
EUR (€)
Jan. 27, 2017
USD ($)
Jan. 27, 2017
EUR (€)
Business Acquisition [Line Items]                  
Payments to Acquire Businesses, Net of Cash Acquired       $ 0.0 $ 292.6        
Net sales       $ 405.8 359.8        
Esselte Group Holdings AB                  
Business Acquisition [Line Items]                  
Goodwill $ 106.5                
Payments to Acquire Businesses, Gross 326.8 € 302.9              
Working Capital Adjustments to Purchase Price 0.3                
Cash acquired 34.2                
Payments to Acquire Businesses, Net of Cash Acquired 292.3                
Business Acquisition, Consideration Held in Escrow 8.7 € 8.1              
Net sales     $ 44.2            
Warranty and indemnity insurance policy $ 43.2           € 40.0    
Selling, General and Administrative Expenses [Member] | Esselte Group Holdings AB                  
Business Acquisition [Line Items]                  
Transaction Related Costs         $ 2.1 $ 5.0      
Senior Secured Notes | Euro Term Loan A                  
Business Acquisition [Line Items]                  
Debt Instrument, Face Amount               $ 320.8 € 300.0
Maximum | Esselte Group Holdings AB                  
Business Acquisition [Line Items]                  
Escrow period 2 years 2 years              
Period of Warranty and Indemnity Policy 7 years 7 years