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Accounting Policies (Details) - USD ($)
$ in Millions
12 Months Ended
Apr. 30, 2018
Apr. 30, 2017
Apr. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense $ 15.4 $ 22.0 $ 34.6
Related income tax benefit 4.6 7.2 10.2
Selling, Distribution And Administrative Expense [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense 13.7 22.3 26.3
Other Special Project Costs [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense $ 1.7 $ (0.3) [1] $ 8.3
[1] During 2017, we concluded that a portion of the performance objectives were unachievable, and therefore reversed the life-to-date compensation cost recognized. For additional information, see Note 12: Share-Based Payments.