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Pensions and Other Postretirement Benefits (Tables)
9 Months Ended
Jan. 31, 2022
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 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