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Fair Value of Financial Instruments (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Mar. 31, 2024
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Carrying Amount |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for debt obligations | $ 6,422.9 | $ 5,999.8
Carrying Amount | Term Loan Facility |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for debt obligations | 749.6 | 749.3
Carrying Amount | Commercial Paper |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for debt obligations | 1,539.0 | 1,355.1
Carrying Amount | 0.983% 2024 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 | 4.250% 2025 Notes | Senior Indebtedness |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for debt obligations | 1,196.7 | 1,195.0
Carrying Amount | 5.050% 2029 Notes | Senior Indebtedness |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for debt obligations | 993.2 | 992.6
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 | 6.7
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 | 2020 Senior Convertible Debt | Senior Subordinated Convertible Debt |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for debt obligations | 665.2 | 663.8
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 | 1,234.6 | 0.0
Fair Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for debt obligations | 6,517.1 | 6,106.7
Fair Value | Term Loan Facility |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for debt obligations | 750.0 | 750.0
Fair Value | Commercial Paper |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for debt obligations | 1,544.0 | 1,359.0
Fair Value | 0.983% 2024 Notes | Senior Indebtedness |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for debt obligations | 0.0 | 979.6
Fair Value | 4.250% 2025 Notes | Senior Indebtedness |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for debt obligations | 1,195.6 | 1,181.8
Fair Value | 5.050% 2029 Notes | Senior Indebtedness |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for debt obligations | 1,026.6 | 1,000.6
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 | 22.9 | 25.6
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 | 79.5 | 101.3
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 | 662.9 | 708.8
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 | $ 1,235.6 | $ 0.0

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