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Pensions and Other Postretirement Benefits (Tables) | 9 Months Ended
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Jan. 31, 2020
Retirement Benefits [Abstract] |
Net periodic benefit cost | The components of our net periodic benefit cost for defined benefit pension and other postretirement benefit plans are shown below.
| Three Months Ended January 31, |  |  |  |  |  |
| Defined Benefit Pension Plans |  |  |  | Other Postretirement Benefits |  |
| 2020 |  | 2019 |  | 2020 |  | 2019
Service cost | $ | 0.4 |  |  | $ | 0.6 |  |  | $ | 0.4 |  |  | $ | 0.5 |
Interest cost | 5.2 |  |  | 5.9 |  |  | 0.5 |  |  | 0.6 |
Expected return on plan assets | (6.0) |  |  | (6.8) |  |  | — |  |  | — |
Amortization of net actuarial loss (gain) | 2.0 |  |  | 2.0 |  |  | (0.1) |  |  | (0.1) |
Amortization of prior service cost (credit) | 0.2 |  |  | 0.2 |  |  | (0.2) |  |  | (0.4) |
Curtailment loss (gain) | — |  |  | 0.3 |  |  | — |  |  | — |
Settlement loss (gain) | — |  |  | 4.2 |  |  | — |  |  | — |
Net periodic benefit cost | $ | 1.8 |  |  | $ | 6.4 |  |  | $ | 0.6 |  |  | $ | 0.6 |
| Nine Months Ended January 31, |  |  |  |  |  |
| Defined Benefit Pension Plans |  |  |  | Other Postretirement Benefits |  |
| 2020 |  | 2019 |  | 2020 |  | 2019
Service cost | $ | 1.2 |  |  | $ | 1.7 |  |  | $ | 1.3 |  |  | $ | 1.4 |
Interest cost | 15.7 |  |  | 17.6 |  |  | 1.7 |  |  | 1.8 |
Expected return on plan assets | (18.1) |  |  | (20.3) |  |  | — |  |  | — |
Amortization of net actuarial loss (gain) | 6.0 |  |  | 6.1 |  |  | (0.2) |  |  | (0.4) |
Amortization of prior service cost (credit) | 0.6 |  |  | 0.7 |  |  | (0.8) |  |  | (1.0) |
Curtailment loss (gain) | — |  |  | 0.3 |  |  | — |  |  | — |
Settlement loss (gain) | — |  |  | 4.2 |  |  | — |  |  | — |
Net periodic benefit cost | $ | 5.4 |  |  | $ | 10.3 |  |  | $ | 2.0 |  |  | $ | 1.8 |

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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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