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Revenue (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Disaggregation of Revenue [Line Items]          
Performance obligation $ 0.0   $ 0.0   $ 0.0
Accrued sales returns 2.2   2.2   $ 1.8
Revenue from contracts with customers 243.9 $ 235.8 724.7 $ 679.2  
Service Revenue          
Disaggregation of Revenue [Line Items]          
Revenue from contracts with customers 0.0 0.0 0.0 0.0  
MRO Products and Industrial Supplies | Reportable Geographical Components | United States          
Disaggregation of Revenue [Line Items]          
Revenue from contracts with customers 232.8 225.1 690.3 647.5  
MRO Products and Industrial Supplies | Reportable Geographical Components | Canada          
Disaggregation of Revenue [Line Items]          
Revenue from contracts with customers $ 11.1 $ 10.7 $ 34.4 $ 31.7  
Revenue from Contract with Customer | Product Concentration Risk | Service Revenue          
Disaggregation of Revenue [Line Items]          
Service revenue, percentage of revenue 1.00% 1.00% 1.00% 1.00%