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Acquisitions (Narrative) (Details)
$ in Millions, $ in Millions, $ in Millions
 3 Months Ended 12 Months Ended
Jan. 31, 2019
USD ($)
Jan. 31, 2019
AUD ($)
Jul. 02, 2018
USD ($)
Jul. 02, 2018
MXN ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Cumberland Asset Acquisition            
Business Acquisition [Line Items]            
Payments to acquire business, gross $ 6.0 $ 8.2        
Business Combination, Consideration Transferred, Liabilities Incurred $ 0.6          
GOBA Internacional, SA de CV            
Business Acquisition [Line Items]            
Payments to acquire business, gross     $ 39.9 $ 796.8    
Cash acquired     1.9      
Cost of acquisitions, net of cash acquired     37.2      
Revenue of acquired business since acquisition date         $ 11.8  
Working capital adjustments to purchase price         (0.8)  
Business acquisition, consideration held in escrow     $ 5.8 $ 115.0    
Selling, General and Administrative Expenses | Cumberland Asset Acquisition            
Business Acquisition [Line Items]            
Transaction related costs         $ 0.1  
Selling, General and Administrative Expenses | GOBA Internacional, SA de CV            
Business Acquisition [Line Items]            
Transaction related costs           $ 1.1
Maximum | GOBA Internacional, SA de CV            
Business Acquisition [Line Items]            
Escrow period     5 years 5 years