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Derivative instruments - Schedule of Cross-Currency Swaps (Details) € in Millions, £ in Millions, $ in Millions | Mar. 31, 2025 USD ($) | Mar. 31, 2025 EUR (€) | Mar. 31, 2025 GBP (£)
--- | --- | --- | ---
2.00% 2026 euro Notes | Notes |  |  |
Derivative [Line Items] |  |  |
Interest rate, stated percentage | 2.00% | 2.00% | 2.00%
5.50% 2026 pound sterling Notes | Notes |  |  |
Derivative [Line Items] |  |  |
Interest rate, stated percentage | 5.50% | 5.50% | 5.50%
4.00% 2029 pound sterling Notes | Notes |  |  |
Derivative [Line Items] |  |  |
Interest rate, stated percentage | 4.00% | 4.00% | 4.00%
Cash flow hedge | Cross-currency swap contracts | 2.00% 2026 euro Notes |  |  |
Derivative [Line Items] |  |  |
Notional amounts | $ 833 | € 750 |
Cash flow hedge | Cross-currency swap contracts | 5.50% 2026 pound sterling Notes |  |  |
Derivative [Line Items] |  |  |
Notional amounts | 747 |  | £ 475
Cash flow hedge | Cross-currency swap contracts | 4.00% 2029 pound sterling Notes |  |  |
Derivative [Line Items] |  |  |
Notional amounts | $ 1,111 |  | £ 700
Cash flow hedge | Cross-currency swap contracts | Euro Member Countries, Euro | 2.00% 2026 euro Notes |  |  |
Derivative [Line Items] |  |  |
Interest rates | 2.00% | 2.00% | 2.00%
Cash flow hedge | Cross-currency swap contracts | United Kingdom, Pounds | 5.50% 2026 pound sterling Notes |  |  |
Derivative [Line Items] |  |  |
Interest rates | 5.50% | 5.50% | 5.50%
Cash flow hedge | Cross-currency swap contracts | United Kingdom, Pounds | 4.00% 2029 pound sterling Notes |  |  |
Derivative [Line Items] |  |  |
Interest rates | 4.00% | 4.00% | 4.00%
Cash flow hedge | Cross-currency swap contracts | United States of America, Dollars | 2.00% 2026 euro Notes |  |  |
Derivative [Line Items] |  |  |
Interest rates | 3.90% | 3.90% | 3.90%
Cash flow hedge | Cross-currency swap contracts | United States of America, Dollars | 5.50% 2026 pound sterling Notes |  |  |
Derivative [Line Items] |  |  |
Interest rates | 6.00% | 6.00% | 6.00%
Cash flow hedge | Cross-currency swap contracts | United States of America, Dollars | 4.00% 2029 pound sterling Notes |  |  |
Derivative [Line Items] |  |  |
Interest rates | 4.60% | 4.60% | 4.60%

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