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Segment Information - Profit or loss information (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]    
Revenues $ 3,484.7 $ 3,644.8
Cost of sales (exclusive of depreciation and amortization shown below) 2,451.4 2,516.6
Depreciation and amortization expense 68.7 63.6
Interest expense 11.5 9.7
Income tax provision 61.9 92.4
Net income 200.5 303.8
Other Segment Disclosures    
Purchases of property, plant and equipment 86.9 108.7
Metals Service Centers    
Other Segment Disclosures    
Purchases of property, plant and equipment 86.9 108.7
Metals Service Centers | Operating segments    
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]    
Revenues 3,484.7 3,644.8
Cost of sales (exclusive of depreciation and amortization shown below) 2,451.4 2,516.6
Compensation expense 420.1 413.8
Other segment items 270.6 244.9
Depreciation and amortization expense 68.7 63.6
Interest expense 11.5 9.7
Income tax provision 61.9 92.4
Net income $ 200.5 $ 303.8