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Equity Investments - Additional Information (Detail)
$ in Millions
12 Months Ended
Dec. 31, 2023
USD ($)
Facility
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Oct. 27, 2023
Oct. 26, 2023
Schedule Of Equity Method Investments [Line Items]          
Equity method investments $ 479.5 $ 562.3      
Nucor JFE Steel Mexico [Member]          
Schedule Of Equity Method Investments [Line Items]          
Noncontrolling interest, ownership percentage by parent 51.00%     51.00% 50.00%
Additional equity investment interest percent purchased 1.00%     1.00%  
NuMit LLC [Member]          
Schedule Of Equity Method Investments [Line Items]          
Equity method investment, ownership percentage 50.00%        
Equity method investments $ 431.9 423.9      
Distributions from affiliates $ 32.9 55.6 $ 0.2    
Steel Technologies LLC [Member]          
Schedule Of Equity Method Investments [Line Items]          
Equity method investment, ownership percentage 100.00%        
Number of sheet processing facilities operated by Steel Technologies | Facility 32        
Nucor-JFE Steel Mexico [Member]          
Schedule Of Equity Method Investments [Line Items]          
Equity method investment, ownership percentage 50.00%        
Equity method investments   $ 91.8