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Fair Value of Financial Instruments - Carrying Amounts and Fair Values of Debt Obligations (Details) - USD ($) $ in Millions	Sep. 30, 2025	Mar. 31, 2025
Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value disclosure for debt obligations	$ 5,375.9	$ 5,630.4
Carrying Amount | Commercial Paper
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value disclosure for debt obligations	1,115.5	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	0.0	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	995.9	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	994.6	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	994.7	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	1,237.3	1,236.0
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value disclosure for debt obligations	5,452.6	5,608.2
Fair Value | Commercial Paper
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value disclosure for debt obligations	1,118.0	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	0.0	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	1,014.5	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	1,021.1	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	1,021.2	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	67.2	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	$ 1,210.6	$ 1,173.4

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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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