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Pensions and Other Postretirement Benefits (Details 1) - USD ($)
$ in Millions
 12 Months Ended
Apr. 30, 2018
Apr. 30, 2017
Apr. 30, 2016
Defined Benefit Pension Plans [Member]      
Other changes in plan assets and benefit liabilities recognized in accumulated other comprehensive loss before income taxes:      
Prior service credit (cost) arising during the year $ 0.0 $ 2.1 $ (5.3)
Net actuarial gain (loss) arising during the year 3.5 1.5 (43.3)
Amortization of prior service cost (credit) 0.9 1.1 0.7
Amortization of net actuarial loss (gain) 11.5 13.8 10.9
Curtailment loss (gain) 0.0 28.8 (6.5)
Settlement loss (gain) 2.3 (0.7) 0.0
Foreign currency translation (1.8) 2.5 0.8
Net change for year 16.4 49.1 (42.7)
Other Postretirement Benefits [Member]      
Other changes in plan assets and benefit liabilities recognized in accumulated other comprehensive loss before income taxes:      
Prior service credit (cost) arising during the year (0.2) 3.0 0.0
Net actuarial gain (loss) arising during the year 5.5 2.3 0.0
Amortization of prior service cost (credit) (1.4) (1.5) (1.1)
Amortization of net actuarial loss (gain) (0.3) (0.2) (0.3)
Curtailment loss (gain) 0.0 0.1 (0.3)
Settlement loss (gain) 0.0 0.0 0.0
Foreign currency translation (0.1) 0.0 0.0
Net change for year $ 3.5 $ 3.7 $ (1.7)