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Fair Value of Financial Instruments - Carrying Amounts and Fair Values of Debt Obligations (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Mar. 31, 2025
--- | --- | ---
Carrying Amount |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for debt obligations | $ 5,375.9 | $ 5,630.4
Carrying Amount | Commercial Paper |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for debt obligations | 1,115.5 | 174.9
Carrying Amount | 4.250% 2025 Notes | Senior indebtedness |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for debt obligations | 0.0 | 1,198.5
Carrying Amount | 4.900% 2028 Notes | Senior indebtedness |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for debt obligations | 995.9 | 995.0
Carrying Amount | 5.050% 2029 Notes | Senior indebtedness |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for debt obligations | 994.6 | 993.9
Carrying Amount | 5.050% 2030 Notes | Senior indebtedness |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for debt obligations | 994.7 | 994.2
Carrying Amount | 2017 Senior Convertible Debt | Senior subordinated convertible debt |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for debt obligations | 37.9 | 37.9
Carrying Amount | 2024 Senior Convertible Debt | Senior subordinated convertible debt |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for debt obligations | 1,237.3 | 1,236.0
Fair Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for debt obligations | 5,452.6 | 5,608.2
Fair Value | Commercial Paper |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for debt obligations | 1,118.0 | 175.0
Fair Value | 4.250% 2025 Notes | Senior indebtedness |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for debt obligations | 0.0 | 1,196.9
Fair Value | 4.900% 2028 Notes | Senior indebtedness |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for debt obligations | 1,014.5 | 1,002.5
Fair Value | 5.050% 2029 Notes | Senior indebtedness |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for debt obligations | 1,021.1 | 1,005.8
Fair Value | 5.050% 2030 Notes | Senior indebtedness |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for debt obligations | 1,021.2 | 996.9
Fair Value | 2017 Senior Convertible Debt | Senior subordinated convertible debt |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for debt obligations | 67.2 | 57.7
Fair Value | 2024 Senior Convertible Debt | Senior subordinated convertible debt |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for debt obligations | $ 1,210.6 | $ 1,173.4

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