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Pensions and Other Postretirement Benefits (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jan. 31, 2020
Jan. 31, 2019
Jan. 31, 2020
Jan. 31, 2019
Defined Benefit Pension Plans        
Components of net periodic benefit cost        
Service Cost $ 0.4 $ 0.6 $ 1.2 $ 1.7
Interest Cost 5.2 5.9 15.7 17.6
Expected Return on Plan Assets (6.0) (6.8) (18.1) (20.3)
Amortization of net actuarial loss (gain) 2.0 2.0 6.0 6.1
Amortization of prior service cost (credit) 0.2 0.2 0.6 0.7
Curtailment loss (gain) 0.0 0.3 0.0 0.3
Settlement loss (gain) 0.0 4.2 0.0 4.2
Net Periodic Benefit Cost 1.8 6.4 5.4 10.3
Other Postretirement Benefits        
Components of net periodic benefit cost        
Service Cost 0.4 0.5 1.3 1.4
Interest Cost 0.5 0.6 1.7 1.8
Expected Return on Plan Assets 0.0 0.0 0.0 0.0
Amortization of net actuarial loss (gain) (0.1) (0.1) (0.2) (0.4)
Amortization of prior service cost (credit) (0.2) (0.4) (0.8) (1.0)
Curtailment loss (gain) 0.0 0.0 0.0 0.0
Settlement loss (gain) 0.0 0.0 0.0 0.0
Net Periodic Benefit Cost $ 0.6 $ 0.6 $ 2.0 $ 1.8