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Pensions and Other Postretirement Benefits
 9 Months Ended
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 PlansOther Postretirement Benefits
 2020201920202019
Service cost$0.4  $0.6  $0.4  $0.5  
Interest cost5.2  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 PlansOther Postretirement Benefits
 2020201920202019
Service cost$1.2  $1.7  $1.3  $1.4  
Interest cost15.7  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