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Derivative Instruments and Hedging Activities - Narrative (Details) | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2025 USD ($) | Sep. 30, 2025 USD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2025 CNY (¥) | Jun. 30, 2025 USD ($) | Jun. 30, 2025 CNY (¥) | Jun. 30, 2024 USD ($) | Jun. 30, 2024 CNY (¥) | Mar. 31, 2024 USD ($) | Mar. 31, 2024 CNY (¥)
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Percentage of foreign exchange rate exposure hedged minimum (as percentage) | 70.00% |  |  | 70.00% |  |  |  |  |  |
Percentage of foreign exchange rate exposure hedged, maximum (as percentage) | 90.00% |  |  | 90.00% |  |  |  |  |  |
Cash collateral received | $ 0 | $ 0 |  |  |  |  |  |  |  |
Cash collateral pledged | 0 | 0 |  |  |  |  |  |  |  |
Pre tax gain to be reclassified within next 12 months | 30,000,000 |  |  |  |  |  |  |  |  |
Cash Flow Hedging |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Ineffectiveness recognized from cash flow hedges | 0 |  | $ 0 |  |  |  |  |  |  |
Interest Rate Swap | Net Investment Hedging |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Total amount |  | $ 325,000,000 | $ 60,000,000 |  |  |  |  |  |  |
Derivative, term of contract |  | 3 years |  |  |  |  |  |  |  |
Interest Rate Swap | Net Investment Hedging | Long |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Average fixed interest rate (as percentage) |  | 1.85% | 2.85% |  |  |  |  |  |  |
Interest Rate Swap | Net Investment Hedging | Short |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Average fixed interest rate (as percentage) |  | 0.00% | 0.00% |  |  |  |  |  |  |
Foreign currency exchange derivatives | China | Derivatives and Hedging Activities Designated as Hedging Instruments under ASC 815 |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Notional amount of derivative asset | 58,000,000 |  |  | ¥ 413,000,000 |  |  |  |  |  |
Foreign currency exchange derivatives | Net Investment Hedging |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Effective portion of pretax gains (loss) related to net investment hedges | 0 |  | $ 4,000,000 |  |  |  |  |  |  |
Gains reclassified into income for net investment hedges | $ 0 |  | $ 0 |  |  |  |  |  |  |
Foreign currency exchange derivatives | Net Investment Hedging | China |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Notional amount of derivative asset |  |  |  |  | $ 78,000,000 | ¥ 559,000,000 | $ 78,000,000 | ¥ 570,000,000 |  |
Cross-currency interest rate swaps | Net Investment Hedging | China |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Notional amount of derivative asset |  |  |  |  |  |  |  |  | $ 96,000,000 | ¥ 685,000,000

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