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Fair Value of Financial Instruments (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Mar. 31, 2023
--- | --- | ---
Carrying Amount |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for debt obligations | $ 6,075.8 | $ 6,439.9
Carrying Amount | Commercial Paper |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for debt obligations | 996.7 | 0.0
Carrying Amount | Revolving Credit Facility | Line of Credit |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for debt obligations | 31.9 | 91.4
Carrying Amount | Term Loan Facility | Line of Credit |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for debt obligations | 749.1 | 0.0
Carrying Amount | 4.333% 2023 Notes | Senior Indebtedness |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for debt obligations | 0.0 | 999.4
Carrying Amount | 2.670% 2023 Notes | Senior Indebtedness |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for debt obligations | 0.0 | 999.4
Carrying Amount | 0.972% 2024 Notes | Senior Indebtedness |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for debt obligations | 1,399.2 | 1,398.2
Carrying Amount | 0.983% 2024 Notes | Senior Indebtedness |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for debt obligations | 998.7 | 997.9
Carrying Amount | 4.250% 2025 Notes | Senior Indebtedness |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for debt obligations | 1,193.3 | 1,191.8
Carrying Amount | 2015 Senior Convertible Debt | Senior Subordinated Convertible Debt |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for debt obligations | 6.7 | 12.4
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 | 37.8 | 81.8
Carrying Amount | 2020 Senior Convertible Debt | Senior Subordinated Convertible Debt |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for debt obligations | 662.4 | 661.1
Carrying Amount | 2017 Junior Convertible Debt | Junior Subordinated Convertible Debt |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for debt obligations | 0.0 | 6.5
Fair Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for debt obligations | 6,082.7 | 6,516.0
Fair Value | Commercial Paper |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for debt obligations | 1,000.0 | 0.0
Fair Value | Revolving Credit Facility | Line of Credit |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for debt obligations | 39.0 | 100.0
Fair Value | Term Loan Facility | Line of Credit |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for debt obligations | 750.0 | 0.0
Fair Value | 4.333% 2023 Notes | Senior Indebtedness |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for debt obligations | 0.0 | 997.1
Fair Value | 2.670% 2023 Notes | Senior Indebtedness |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for debt obligations | 0.0 | 985.4
Fair Value | 0.972% 2024 Notes | Senior Indebtedness |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for debt obligations | 1,374.1 | 1,337.6
Fair Value | 0.983% 2024 Notes | Senior Indebtedness |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for debt obligations | 955.1 | 941.9
Fair Value | 4.250% 2025 Notes | Senior Indebtedness |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for debt obligations | 1,162.9 | 1,176.0
Fair Value | 2015 Senior Convertible Debt | Senior Subordinated Convertible Debt |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for debt obligations | 23.6 | 41.8
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 | 84.1 | 189.6
Fair Value | 2020 Senior Convertible Debt | Senior Subordinated Convertible Debt |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for debt obligations | 693.9 | 732.1
Fair Value | 2017 Junior Convertible Debt | Junior Subordinated Convertible Debt |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for debt obligations | $ 0.0 | $ 14.5

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