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Fair Value of Financial Instruments (Details) - USD ($) $ in Millions | Sep. 30, 2022 | Mar. 31, 2022
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Carrying Amount |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for debt obligations | $ 7,303.5 | $ 7,687.4
Carrying Amount | Revolving Credit Facility |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for debt obligations | 962.7 | 1,388.5
Carrying Amount | 4.333% 2023 Notes |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for debt obligations | 997.6 | 995.8
Carrying Amount | 2.670% 2023 Notes |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for debt obligations | 998.6 | 997.9
Carrying Amount | 0.972% 2024 Notes |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for debt obligations | 1,397.3 | 1,396.2
Carrying Amount | 0.983% 2024 Notes |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for debt obligations | 997.1 | 996.4
Carrying Amount | 4.250% 2025 Notes |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for debt obligations | 1,190.1 | 1,188.5
Carrying Amount | 2015 Senior Convertible Debt |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for debt obligations | 12.3 | 30.6
Carrying Amount | 2017 Senior Convertible Debt |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for debt obligations | 81.7 | 104.1
Carrying Amount | 2020 Senior Convertible Debt |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for debt obligations | 659.7 | 584.0
Carrying Amount | 2017 Junior Convertible Debt |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for debt obligations | 6.4 | 5.4
Fair Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for debt obligations | 7,207.8 | 8,105.9
Fair Value | Revolving Credit Facility |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for debt obligations | 972.1 | 1,399.1
Fair Value | 4.333% 2023 Notes |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for debt obligations | 998.0 | 1,017.1
Fair Value | 2.670% 2023 Notes |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for debt obligations | 982.1 | 997.7
Fair Value | 0.972% 2024 Notes |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for debt obligations | 1,319.9 | 1,343.9
Fair Value | 0.983% 2024 Notes |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for debt obligations | 921.2 | 946.3
Fair Value | 4.250% 2025 Notes |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for debt obligations | 1,152.0 | 1,213.6
Fair Value | 2015 Senior Convertible Debt |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for debt obligations | 34.7 | 115.4
Fair Value | 2017 Senior Convertible Debt |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for debt obligations | 142.8 | 285.6
Fair Value | 2020 Senior Convertible Debt |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for debt obligations | 672.2 | 765.5
Fair Value | 2017 Junior Convertible Debt |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value disclosure for debt obligations | $ 12.8 | $ 21.7

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