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Fair Value of Financial Instruments (Tables)

12 Months Ended

Mar. 31, 2025

Fair Value Disclosures [Abstract]

Summary of Carrying Amount and Fair Values

The following table shows the carrying amounts and fair values of the Company's debt obligations (in millions):

			March 31,
			2025												2024
			Carrying Amount(1)						Fair Value						Carrying Amount(1)						Fair Value
2025 Term Loan Facility			$	—					$	—					$	749.3					$	750.0
Commercial Paper			174.9						175.0						1,355.1						1,359.0
0.983% 2024 Notes			—						—						999.4						979.6
4.250% 2025 Notes			1,198.5						1,196.9						1,195.0						1,181.8
4.900% 2028 Notes			995.0						1,002.5						—						—
5.050% 2029 Notes			993.9						1,005.8						992.6						1,000.6
5.050% 2030 Notes			994.2						996.9						—						—
2015 Senior Convertible Debt			—						—						6.7						25.6
2017 Senior Convertible Debt			37.9						57.7						37.9						101.3
2020 Senior Convertible Debt			—						—						663.8						708.8
2024 Senior Convertible Debt			1,236.0						1,173.4						—						—
Total			$	5,630.4					$	5,608.2					$	5,999.8					$	6,106.7

(1) The carrying amounts presented are net of debt discounts and debt issuance costs (see Note 6 for further information).

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- Definition

Tabular disclosure of information pertaining to carrying amount and estimated fair value of short-term and long-term debt instruments or arrangements, including but not limited to, identification of terms, features, and collateral requirements.

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