Pensions and Other Postretirement Benefits (Details 6) - Defined Benefit Pension Plans - USD ($) $ in Millions		Apr. 30, 2023	Apr. 30, 2022
Additional information related to the Company's defined benefit pension plans
Accumulated benefit obligation for all pension plans		$ 374.6	$ 423.9
Plans with an accumulated benefit obligation in excess of plan assets:
Accumulated benefit obligation (A)	[1]	194.6	422.4
Fair value of plan assets		133.1	309.0
Plans with a projected benefit obligation in excess of plan assets:
Projected benefit obligation	[1]	198.9	427.8
Fair value of plan assets		$ 133.1	$ 309.0

[1] The decrease in our defined benefit pension plan obligations for plans in excess of plan assets, as compared to 2022, is primarily driven by the fact that we made contributions during 2023, which significantly improved the funded status of the majority of our defined benefit pension plans.