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Fair Value Measurements - Narrative (Details) - USD ($) | Sep. 30, 2025 | Mar. 31, 2025
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Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Estimated amounts to be reclassified over 12 months | $ 1,000,000 |
Cash and cash equivalents, at fair value | 816,000,000 | $ 885,000,000
Term Loan | Level 2 |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Estimated fair value of long-term debt | 3,991,000,000 | 3,954,000,000
Recurring Fair Value Measurements | Money Market Funds |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Cash and cash equivalents, at fair value | 370,000,000 | 802,000,000
Fair Value, Nonrecurring |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Investments, fair value | 103,000,000 | $ 85,000,000
Interest Rate Swap | Cash Flow Hedging | Designated as Hedging Instrument |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Notional amount | $ 350,000,000 |

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