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Pensions and Other Postretirement Benefits | 9 Months Ended
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Jan. 31, 2020
Retirement Benefits [Abstract] |
Pensions and Other Postretirement Benefits | 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 The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 + Details
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