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Fair Value of Financial Instruments (Tables) | 6 Months Ended
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Sep. 30, 2024
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, 2024 |  | March 31, 2024
| Carrying Amount(1) |  | Fair Value |  | Carrying Amount(1) |  | Fair Value
2025 Term Loan Facility | $ | 749.6 |  |  | $ | 750.0 |  |  | $ | 749.3 |  |  | $ | 750.0 |
Commercial Paper | 1,539.0 |  |  | 1,544.0 |  |  | 1,355.1 |  |  | 1,359.0 |
0.983% 2024 Notes | — |  |  | — |  |  | 999.4 |  |  | 979.6 |
4.250% 2025 Notes | 1,196.7 |  |  | 1,195.6 |  |  | 1,195.0 |  |  | 1,181.8 |
5.050% 2029 Notes | 993.2 |  |  | 1,026.6 |  |  | 992.6 |  |  | 1,000.6 |
2015 Senior Convertible Debt | 6.7 |  |  | 22.9 |  |  | 6.7 |  |  | 25.6 |
2017 Senior Convertible Debt | 37.9 |  |  | 79.5 |  |  | 37.9 |  |  | 101.3 |
2020 Senior Convertible Debt | 665.2 |  |  | 662.9 |  |  | 663.8 |  |  | 708.8 |
2024 Senior Convertible Debt | 1,234.6 |  |  | 1,235.6 |  |  | — |  |  | — |
Total | $ | 6,422.9 |  |  | $ | 6,517.1 |  |  | $ | 5,999.8 |  |  | $ | 6,106.7 |
(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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