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Pensions and Other Postretirement Benefits | 9 Months Ended
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Jan. 31, 2022
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
| 2022 |  | 2021 |  | 2022 |  | 2021
Service cost | $ | 0.4 |  |  | $ | 0.5 |  |  | $ | 0.3 |  |  | $ | 0.5 |
Interest cost | 3.1 |  |  | 3.3 |  |  | 0.3 |  |  | 0.4 |
Expected return on plan assets | (3.9) |  |  | (4.6) |  |  | — |  |  | — |
Amortization of net actuarial loss (gain) | 1.7 |  |  | 2.6 |  |  | (0.1) |  |  | — |
Amortization of prior service cost (credit) | 0.3 |  |  | 0.2 |  |  | (0.2) |  |  | (0.3) |
Settlement loss (gain) | 1.3 |  |  | 0.2 |  |  | — |  |  | — |
Net periodic benefit cost | $ | 2.9 |  |  | $ | 2.2 |  |  | $ | 0.3 |  |  | $ | 0.6 |
| Nine Months Ended January 31,
| Defined Benefit Pension Plans |  | Other Postretirement Benefits
| 2022 |  | 2021 |  | 2022 |  | 2021
Service cost | $ | 1.3 |  |  | $ | 1.4 |  |  | $ | 0.9 |  |  | $ | 1.4 |
Interest cost | 9.3 |  |  | 11.1 |  |  | 1.0 |  |  | 1.3 |
Expected return on plan assets | (12.1) |  |  | (14.7) |  |  | — |  |  | — |
Amortization of net actuarial loss (gain) | 5.2 |  |  | 8.4 |  |  | (0.3) |  |  | — |
Amortization of prior service cost (credit) | 0.7 |  |  | 0.6 |  |  | (0.5) |  |  | (0.8) |
Settlement loss (gain) | 7.5 |  |  | 30.8 |  |  | — |  |  | — |
Net periodic benefit cost | $ | 11.9 |  |  | $ | 37.6 |  |  | $ | 1.1 |  |  | $ | 1.9 |
During the second quarter of 2021, we transferred $82.6 in obligations of our Canadian defined benefit pension plan to an insurance company through the purchase of an irrevocable group annuity contract (the “Canadian buy-out contract”). The group annuity contract was purchased using assets from the pension trust. As a result of this transaction, during the second quarter of 2021, we recognized a noncash pre-tax settlement charge of $27.9 to accelerate the unrecognized losses within accumulated other comprehensive income (loss) that would have otherwise been recognized in subsequent periods. This settlement charge was included within other income (expense) – net in the Condensed Statement of Consolidated Income. We did not recognize any additional charges related to the Canadian buy-out contract during the three and nine months ended January 31, 2022.

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