Employee Benefit Plans (Tables)

12 Months Ended

Mar. 31, 2020

Retirement Benefits [Abstract]

Schedule of Net Benefit Costs

The aggregate net pension expense relating to these two plans is as follows (in millions):

	Year Ended March 31,
	2020		2019		2018
Service costs	$	1.7	$	1.5	$	2.2
Interest costs	0.9		1.1		1.0
Amortization of actuarial loss	0.8		0.4		0.8
Net pension period cost	$	3.4	$	3.0	$	4.0

Schedule of Changes in Projected Benefit Obligations

The change in projected benefit obligation and the accumulated benefit obligation, were as follows (in millions):

	Year Ended March 31,
	2020			2019
Projected benefit obligation at the beginning of the year	$	72.7		$	61.0
Additions due to acquisition of Microsemi	—			9.8
Service cost	1.7			1.5
Interest cost	0.9			1.1
Actuarial losses	(2.6		)	6.0
Benefits paid	(1.5		)	(0.9		)
Foreign currency exchange rate changes	(1.2		)	(5.8		)
Projected benefit obligation at the end of the year	$	70.0		$	72.7
Accumulated benefit obligation at the end of the year	$	65.1		$	66.7
Weighted average assumptions
Discount rate	1.48		%	1.41		%
Rate of compensation increase	2.77		%	2.79		%

Schedule of Assumptions Used

The change in projected benefit obligation and the accumulated benefit obligation, were as follows (in millions):

	Year Ended March 31,
	2020			2019
Projected benefit obligation at the beginning of the year	$	72.7		$	61.0
Additions due to acquisition of Microsemi	—			9.8
Service cost	1.7			1.5
Interest cost	0.9			1.1
Actuarial losses	(2.6		)	6.0
Benefits paid	(1.5		)	(0.9		)
Foreign currency exchange rate changes	(1.2		)	(5.8		)
Projected benefit obligation at the end of the year	$	70.0		$	72.7
Accumulated benefit obligation at the end of the year	$	65.1		$	66.7
Weighted average assumptions
Discount rate	1.48		%	1.41		%
Rate of compensation increase	2.77		%	2.79		%

Schedule of Expected Benefit Payments

Future estimated expected benefit payments for fiscal year 2021 through 2030 are as follows (in millions):

Fiscal Year Ending March 31,	Expected Benefit Payments
2021	$	1.3
2022	1.5
2023	1.8
2024	2.4
2025	2.2
2026 through 2030	12.9
Total	$	22.1