v3.25.1
Segment, Geographical Area, Major Customer and Major Supplier Information (Income Reconciliation) (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Reconciliation of income from reportable segments to net income attributable to common shareholder      
Adjusted EBITDA $ 1,802 $ 1,873 $ 1,811
Depreciation and amortization (575) (554) (540)
Interest expense and amortization of debt issuance costs (275) (298) (274)
Adjustment to reconcile proportional consolidation (47) (44) (53)
Unrealized gains (losses) on change in fair value of derivative instruments, net 57 (36) 23
Realized losses (gains) on derivative instruments not included in Adjusted EBITDA (5) 6 4
Loss on extinguishment of debt, net (7) (5) 0
Restructuring and impairment, net (53) (42) (33)
Loss on sale or disposal of assets, net (4) (6) (1)
Metal price lag 69 (70) (130)
Sierre flood losses, net of recoveries (105) 0 0
Other, net (15) (6) (1)
Income from continuing operations before income tax provision 842 818 806
Loss from discontinued operations, net of tax 0 0 (2)
Income tax provision (159) (218) (147)
Net loss attributable to noncontrolling interests 0 0 1
Net income attributable to our common shareholder 683 600 658
Other nonrecurring expense 10   10
Operating Segments      
Reconciliation of income from reportable segments to net income attributable to common shareholder      
Depreciation and amortization (586) (567) (552)
Income tax provision (186) (152) (88)
Operating Segments | North America Segment      
Reconciliation of income from reportable segments to net income attributable to common shareholder      
Adjusted EBITDA 640 749 673
Depreciation and amortization (231) (228) (224)
Restructuring and impairment, net (30) (35) (28)
Income tax provision (4) 16 39
Operating Segments | Europe Segment      
Reconciliation of income from reportable segments to net income attributable to common shareholder      
Adjusted EBITDA 306 321 286
Depreciation and amortization (173) (167) (160)
Restructuring and impairment, net (1) (2) 0
Income tax provision (28) (40) 6
Operating Segments | Asia Segment      
Reconciliation of income from reportable segments to net income attributable to common shareholder      
Adjusted EBITDA 347 334 339
Depreciation and amortization (94) (91) (87)
Restructuring and impairment, net (17) 0 1
Income tax provision (55) (36) (8)
Operating Segments | South America      
Reconciliation of income from reportable segments to net income attributable to common shareholder      
Adjusted EBITDA 504 472 522
Depreciation and amortization (88) (81) (81)
Restructuring and impairment, net (3) (5) (1)
Income tax provision (99) (92) (125)
Intersegment eliminations      
Reconciliation of income from reportable segments to net income attributable to common shareholder      
Adjusted EBITDA 5 (3) (9)
Depreciation and amortization 11 13 12
Income tax provision $ 27 $ (66) $ (59)