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Acquisitions (Details) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 USD ($) item | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) $ / shares
Acquisitions |  |  |
Net sales | $ 14,805.9 | $ 17,025.0 | $ 14,093.3
Number of states in which the company operates metal service center network | item | 40 |  |
Goodwill | $ 2,111.1 | $ 2,105.9 | 2,107.6
2021 Acquisitions |  |  |
Acquisitions |  |  |
Net sales | $ 722.1 |  |
Transaction costs |  |  | 7.7
Pro forma: |  |  |
Net sales |  |  | 14,820.5
Net income attributable to Reliance |  |  | $ 1,518.0
Basic earnings per common share attributable to Reliance shareholders (in dollars per share) | $ / shares |  |  | $ 24.01
Diluted earnings per common share attributable to Reliance shareholders (in dollars per share) | $ / shares |  |  | $ 23.60

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