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Summary of Significant Accounting Policies - Business (Details)
 12 Months Ended
Dec. 31, 2020
item
location
Summary of Significant Accounting Policies  
Approximate number of locations in which company operates metal service center network | location 300
Number of states in which the company operates metal service center network 40
Number of countries in which entity operates outside the U.S. 13
Minimum number of products the company distributes 100,000