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Employee Benefit Plans (Tables) | 12 Months Ended
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Mar. 31, 2019
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,
| 2019 |  | 2018 |  | 2017
Service costs | $ | 1.5 |  |  | $ | 2.2 |  |  | $ | 1.4 |
Interest costs | 1.1 |  |  | 1.0 |  |  | 1.0 |
Amortization of actuarial loss | 0.4 |  |  | 0.8 |  |  | — |
Settlements | — |  |  | — |  |  | 0.5 |
Net pension period cost | $ | 3.0 |  |  | $ | 4.0 |  |  | $ | 2.9 |
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,
| 2019 |  | 2018
Projected benefit obligation at the beginning of the year | $ | 61.0 |  |  | $ | 50.4 |
Additions due to acquisition of Microsemi | 9.8 |  |  | — |
Service cost | 1.5 |  |  | 2.2 |
Interest cost | 1.1 |  |  | 1.0 |
Actuarial losses | 6.0 |  |  | 0.7 |
Benefits paid | (0.9 | ) |  | (0.8 | )
Foreign currency exchange rate changes | (5.8 | ) |  | 7.5 |
Projected benefit obligation at the end of the year | $ | 72.7 |  |  | $ | 61.0 |
Accumulated benefit obligation at the end of the year | $ | 66.7 |  |  | $ | 55.5 |
Weighted average assumptions |  |  |
Discount rate | 1.41 | % |  | 1.73 | %
Rate of compensation increase | 2.79 | % |  | 2.91 | %
Schedule of Assumptions Used | The change in projected benefit obligation and the accumulated benefit obligation, were as follows (in millions):
| Year Ended March 31,
| 2019 |  | 2018
Projected benefit obligation at the beginning of the year | $ | 61.0 |  |  | $ | 50.4 |
Additions due to acquisition of Microsemi | 9.8 |  |  | — |
Service cost | 1.5 |  |  | 2.2 |
Interest cost | 1.1 |  |  | 1.0 |
Actuarial losses | 6.0 |  |  | 0.7 |
Benefits paid | (0.9 | ) |  | (0.8 | )
Foreign currency exchange rate changes | (5.8 | ) |  | 7.5 |
Projected benefit obligation at the end of the year | $ | 72.7 |  |  | $ | 61.0 |
Accumulated benefit obligation at the end of the year | $ | 66.7 |  |  | $ | 55.5 |
Weighted average assumptions |  |  |
Discount rate | 1.41 | % |  | 1.73 | %
Rate of compensation increase | 2.79 | % |  | 2.91 | %
Schedule of Expected Benefit Payments | Future estimated expected benefit payments for fiscal year 2020 through 2029 are as follows (in millions):
Fiscal Year Ending March 31, | Expected Benefit Payments
2020 | $ | 1.3 |
2021 | 1.5 |
2022 | 1.9 |
2023 | 1.8 |
2024 | 2.3 |
2025 through 2029 | 11.9 |
Total | $ | 20.7 |

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- Definition Tabular disclosure of the assumptions used to determine for pension plans and/or other employee benefit plans the benefit obligation and net benefit cost, including assumed discount rates, rate increase in compensation increase, and expected long-term rates of return on plan assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the change in the benefit obligation of pension plans and/or other employee benefit plans from the beginning to the end of the period, showing separately, if applicable, the effects of the following: service cost, interest cost, contributions by plan participants, actuarial gains and losses, foreign currency exchange rate changes, benefits paid, plan amendments, business combinations, divestitures, curtailments, settlements, and special and contractual termination benefits. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of benefits expected to be paid by pension plans and/or other employee benefit plans in each of the next five fiscal years and in the aggregate for the five fiscal years thereafter. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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