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Fair Value of Financial Instruments (Details) - USD ($) $ in Millions	Jun. 30, 2025	Mar. 31, 2025
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	$ 289.1	$ 491.1
Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value disclosure for debt obligations	5,458.1	5,630.4
Carrying Amount | Commercial Paper
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value disclosure for debt obligations	0.0	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	1,199.4	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	995.5	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	994.3	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	994.4	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	1,236.6	1,236.0
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value disclosure for debt obligations	5,547.4	5,608.2
Fair Value | Commercial Paper
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value disclosure for debt obligations	0.0	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	1,199.0	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	1,012.0	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	1,015.9	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	1,014.7	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	76.2	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	$ 1,229.6	$ 1,173.4

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- Definition

Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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