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Fair Value of Financial Instruments (Tables) | 6 Months Ended
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Sep. 30, 2025
Fair Value Disclosures [Abstract] |
Summary of Carrying Amount and Fair Values | The following table shows the carrying amounts and fair values of the Company's debt obligations (in millions):
| September 30, 2025 |  | March 31, 2025
| Carrying Amount(1) |  | Fair Value |  | Carrying Amount(1) |  | Fair Value
Commercial Paper | $ | 1,115.5 |  |  | $ | 1,118.0 |  |  | $ | 174.9 |  |  | $ | 175.0 |
4.250% 2025 Notes | — |  |  | — |  |  | 1,198.5 |  |  | 1,196.9 |
4.900% 2028 Notes | 995.9 |  |  | 1,014.5 |  |  | 995.0 |  |  | 1,002.5 |
5.050% 2029 Notes | 994.6 |  |  | 1,021.1 |  |  | 993.9 |  |  | 1,005.8 |
5.050% 2030 Notes | 994.7 |  |  | 1,021.2 |  |  | 994.2 |  |  | 996.9 |
2017 Senior Convertible Debt | 37.9 |  |  | 67.2 |  |  | 37.9 |  |  | 57.7 |
2024 Senior Convertible Debt | 1,237.3 |  |  | 1,210.6 |  |  | 1,236.0 |  |  | 1,173.4 |
Total | $ | 5,375.9 |  |  | $ | 5,452.6 |  |  | $ | 5,630.4 |  |  | $ | 5,608.2 |
(1) The carrying amounts presented are net of debt discounts and debt issuance costs (see Note 6 for further information).

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- Definition Tabular disclosure of information pertaining to carrying amount and estimated fair value of short-term and long-term debt instruments or arrangements, including but not limited to, identification of terms, features, and collateral requirements. + References No definition available. + Details
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