v3.26.1
Business and Summary of Significant Accounting Policies - Additional Information (Details)
 12 Months Ended
Feb. 18, 2026
USD ($)
$ / shares
shares
Dec. 23, 2025
USD ($)
$ / shares
shares
Mar. 31, 2026
USD ($)
segment
plant
country
continent
shares
Mar. 31, 2025
USD ($)
shares
Mar. 31, 2024
USD ($)
May 24, 2024
shares
May 23, 2024
shares
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Number of countries Company operates in | country     9        
Number of Continents in which Entity Operates | continent     4        
Number of operating plants | plant     29        
Number of plants with recycling operations | plant     15        
Number of operating segments | segment     4        
Goodwill, impairment loss | $     $ 0 $ 0 $ 0    
Supplier Finance Program, Obligation, Statement of Financial Position [Extensible Enumeration]     Accounts payable Accounts payable      
Supplier invoices | $     $ 1,262,000,000 $ 850,000,000      
Assets held for sale | $     $ 15,000,000 $ 6,000,000      
Maximum amortization period of unfunded actuarial liability     15 years        
Common stock, shares issued (in shares) | shares     606,333,333 600,000,000   600,000,000 1,100
Common stock, shares outstanding (in shares) | shares     606,333,333 600,000,000   600,000,000 1,100
AV Minerals (Netherlands) N.V.              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Stock issued during period (in shares) | shares 1,333,333 5,000,000          
Sale of stock, number of shares issued (in shares) | shares 1,333,333 5,000,000          
Sale of stock, consideration received | $ $ 200,000,000 $ 750,000,000          
Sale of stock, price per share (in dollars per share) | $ / shares $ 150 $ 150          
Minimum | Large scale machinery              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Property, plant and equipment, useful life     15 years        
Minimum | Other Machinery and Equipment              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Property, plant and equipment, useful life     2 years        
Maximum | Large scale machinery              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Property, plant and equipment, useful life     25 years        
Maximum | Other Machinery and Equipment              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Property, plant and equipment, useful life     15 years