Fair Value of Financial Instruments (Tables)

12 Months Ended

Mar. 31, 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):

	March 31,
	2021				2020
	Carrying Amount (1)		Fair Value		Carrying Amount (1)		Fair Value
Revolving Credit Facility	$	2,336.6	$	2,346.6	$	2,373.9	$	2,388.5
Term Loan Facility	—		—		1,708.9		1,723.5
Bridge Loan Facility	—		—		608.8		615.0
3.922% 2021 Notes	999.0		1,004.3		993.1		985.0
4.333% 2023 Notes	992.3		1,022.4		988.8		990.0
2.670% 2023 Notes	996.4		1,040.8		—		—
0.972% 2024 Notes	1,394.2		1,394.0		—		—
4.250% 2025 Notes	1,185.5		1,252.6		—		—
2015 Senior Convertible Debt	120.6		485.4		910.1		1,601.8
2017 Senior Convertible Debt	260.2		731.4		1,552.8		2,130.3
2020 Senior Convertible Debt	555.6		778.3		—		—
2017 Junior Convertible Debt	63.7		272.9		345.8		656.2
Total	$	8,904.1	$	10,328.7	$	9,482.2	$	11,090.3

(1) The carrying amounts presented are net of debt discounts and debt issuance costs (see Note 7 for further information).