Fair Value of Financial Instruments (Tables)

6 Months Ended

Sep. 30, 2021

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):

	September 30, 2021				March 31, 2021
	Carrying Amount(1)		Fair Value		Carrying Amount(1)		Fair Value
Revolving Credit Facility	$	1,799.0	$	1,806.6	$	2,336.6	$	2,346.6
3.922% 2021 Notes	—		—		999.0		1,004.3
4.333% 2023 Notes	994.0		1,057.0		992.3		1,022.4
2.670% 2023 Notes	997.2		1,037.0		996.4		1,040.8
0.972% 2024 Notes	1,395.2		1,399.6		1,394.2		1,394.0
0.983% 2024 Notes	995.7		998.2		—		—
4.250% 2025 Notes	1,187.0		1,251.0		1,185.5		1,252.6
2015 Senior Convertible Debt	61.8		240.0		120.6		485.4
2017 Senior Convertible Debt	185.2		530.1		260.2		731.4
2020 Senior Convertible Debt	569.6		755.7		555.6		778.3
2017 Junior Convertible Debt	15.9		71.2		63.7		272.9
Total	$	8,200.6	$	9,146.4	$	8,904.1	$	10,328.7

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