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Fair Value of Financial Instruments (Details) - USD ($) $ in Millions | Jun. 30, 2023 | Mar. 31, 2023
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Carrying Amount |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for debt obligations | $ 6,030.9 | $ 6,439.9
Carrying Amount | Revolving Credit Facility |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for debt obligations | 717.3 | 91.4
Carrying Amount | 4.333% 2023 Notes |  |
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 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for debt obligations | 999.7 | 999.4
Carrying Amount | 0.972% 2024 Notes |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for debt obligations | 1,398.7 | 1,398.2
Carrying Amount | 0.983% 2024 Notes |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for debt obligations | 998.2 | 997.9
Carrying Amount | 4.250% 2025 Notes |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for debt obligations | 1,192.5 | 1,191.8
Carrying Amount | 2015 Senior Convertible Debt |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for debt obligations | 6.8 | 12.4
Carrying Amount | 2017 Senior Convertible Debt |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for debt obligations | 56.0 | 81.8
Carrying Amount | 2020 Senior Convertible Debt |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for debt obligations | 661.7 | 661.1
Carrying Amount | 2017 Junior 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 | 6,087.8 | 6,516.0
Fair Value | Revolving Credit Facility |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for debt obligations | 725.0 | 100.0
Fair Value | 4.333% 2023 Notes |  |
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 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for debt obligations | 994.6 | 985.4
Fair Value | 0.972% 2024 Notes |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for debt obligations | 1,355.2 | 1,337.6
Fair Value | 0.983% 2024 Notes |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for debt obligations | 944.5 | 941.9
Fair Value | 4.250% 2025 Notes |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for debt obligations | 1,159.7 | 1,176.0
Fair Value | 2015 Senior Convertible Debt |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for debt obligations | 17.9 | 41.8
Fair Value | 2017 Senior Convertible Debt |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for debt obligations | 138.2 | 189.6
Fair Value | 2020 Senior Convertible Debt |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for debt obligations | 752.7 | 732.1
Fair Value | 2017 Junior 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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