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Income Taxes (Details 4) - USD ($)
$ in Millions
Apr. 30, 2018
Apr. 30, 2017
Deferred tax liabilities:    
Intangible assets $ 1,393.6 $ 2,248.0
Property, plant, and equipment 98.5 129.8
Other 14.2 16.5
Total deferred tax liabilities 1,506.3 2,394.3
Deferred tax assets:    
Post-employment and other employee benefits 75.5 146.3
Tax credit and loss carryforwards 0.2 1.8
Intangible assets 18.8 25.4
Inventory 5.9 10.5
Property, plant, and equipment 6.4 3.1
Other 25.2 43.8
Total deferred tax assets 132.0 230.9
Valuation allowance (2.9) (3.6)
Total deferred tax assets, less allowance 129.1 227.3
Net deferred tax liability $ 1,377.2 $ 2,167.0