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v3.25.3

Debt - Unamortized Discount and Debt Issuance Costs (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Mar. 31, 2025
--- | --- | ---
Debt Instrument [Line Items] |  |
Total unamortized discount | $ (12.7) | $ (13.1)
Total debt issuance costs | (17.4) | (19.5)
Commercial Paper |  |
Debt Instrument [Line Items] |  |
Total unamortized discount | (2.5) | (0.1)
Senior indebtedness | 4.250% 2025 Notes |  |
Debt Instrument [Line Items] |  |
Total unamortized discount | 0.0 | (1.3)
Total debt issuance costs | 0.0 | (0.2)
Senior indebtedness | 4.900% 2028 Notes |  |
Debt Instrument [Line Items] |  |
Total unamortized discount | (2.7) | (3.3)
Total debt issuance costs | (1.4) | (1.7)
Senior indebtedness | 5.050% 2029 Notes |  |
Debt Instrument [Line Items] |  |
Total unamortized discount | (3.8) | (4.3)
Total debt issuance costs | (1.6) | (1.8)
Senior indebtedness | 5.050% 2030 Notes |  |
Debt Instrument [Line Items] |  |
Total unamortized discount | (3.7) | (4.1)
Total debt issuance costs | (1.6) | (1.7)
Senior subordinated convertible debt | 2017 Senior Convertible Debt |  |
Debt Instrument [Line Items] |  |
Total debt issuance costs | (0.1) | (0.1)
Senior subordinated convertible debt | 2024 Senior Convertible Debt |  |
Debt Instrument [Line Items] |  |
Total debt issuance costs | $ (12.7) | $ (14.0)

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