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Joint Ventures and Noncontrolling Interests (Details)
$ in Millions
12 Months Ended
Mar. 31, 2020
USD ($)
Oct. 23, 2018
Dec. 31, 2019
Dec. 31, 2018
USD ($)
Dec. 31, 2020
location
Mar. 30, 2020
Oct. 22, 2018
Eagle Steel Products, Inc.              
Joint Ventures and Noncontrolling Interests              
Ownership percentage in equity method investment sold     45.00%        
Acero Prime S. de R.L. de C.V.              
Joint Ventures and Noncontrolling Interests              
Ownership interest prior to acquisition (as a percent)             60.00%
Total ownership percentage (as a percent)   100.00%          
Number of locations of the acquiree entity | location         4    
Oregon Feralloy Partners LLC              
Joint Ventures and Noncontrolling Interests              
Ownership percentage in equity method investment         40.00%    
Acero Prime S. de R.L. de C.V.              
Joint Ventures and Noncontrolling Interests              
Ownership percentage acquired   40.00%          
Ownership percentage in consolidated investments other than equity method investment   100.00%         60.00%
Business Acquisition Summary Information For Equity Method Transaction Abstract              
Consideration paid for additional ownership percentage       $ 29.0      
Decrease in noncontrolling interest       (19.7)      
Decrease in Reliance Stockholder's equity       $ 9.3      
Feralloy Processing Company              
Joint Ventures and Noncontrolling Interests              
Payments for acquired equity interest $ 8.0            
Carrying value of noncontrolling interest 1.1            
Increase to additional paid in capital for the direct tax effects resulting from the transaction $ 1.4            
Ownership percentage acquired 49.00%            
Ownership percentage in consolidated investments other than equity method investment 100.00%         51.00%  
Indiana Pickling & Processing Company              
Joint Ventures and Noncontrolling Interests              
Ownership percentage in consolidated investments other than equity method investment         56.00%    
Valex Corp. | South Korea              
Joint Ventures and Noncontrolling Interests              
Ownership percentage in consolidated investments other than equity method investment         96.00%    
Minimum              
Joint Ventures and Noncontrolling Interests              
Ownership percentage in equity method investment         20.00%    
Percentage of ownership for consolidation of financial statements         50.00%    
Maximum              
Joint Ventures and Noncontrolling Interests              
Ownership percentage in equity method investment         50.00%