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Pensions and Other Postretirement Benefits
 9 Months Ended
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 PlansOther Postretirement Benefits
 2022202120222021
Service cost$0.4 $0.5 $0.3 $0.5 
Interest cost3.1 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 PlansOther Postretirement Benefits
 2022202120222021
Service cost$1.3 $1.4 $0.9 $1.4 
Interest cost9.3 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.