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Integration and Restructuring Costs (Details) - 2021 Restructuring Program - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jan. 31, 2022
Jan. 31, 2021
Jan. 31, 2022
Jan. 31, 2021
Apr. 30, 2021
Restructuring Cost and Reserve [Line Items]          
Restructuring and Related Cost, Expected Cost $ 110.0   $ 110.0    
Restructuring and Related Cost, Cost Incurred to Date 46.7   46.7    
Restructuring and Related Cost, Incurred Cost 8.8 $ 1.7 22.6 $ 1.7  
Restructuring and Related Cost, Noncash Charge Incurred to Date 20.3   20.3    
Restructuring and Related Cost, Incurred Noncash Charge 6.7   15.9    
Employee-related costs [Member]          
Restructuring Cost and Reserve [Line Items]          
Restructuring and Related Cost, Cost Incurred to Date 21.1   21.1    
Restructuring and Related Cost, Incurred Cost 1.4 1.7 3.8 1.7  
Restructuring Reserve 3.7   3.7   $ 14.6
Other transition and termination costs          
Restructuring Cost and Reserve [Line Items]          
Restructuring and Related Cost, Cost Incurred to Date 25.6   25.6    
Restructuring and Related Cost, Incurred Cost $ 7.4 $ 0.0 $ 18.8 $ 0.0