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Debt and Financing Arrangements - Narrative (Details)
$ in Millions
12 Months Ended
Apr. 30, 2023
USD ($)
Bank
Apr. 30, 2022
USD ($)
Apr. 30, 2021
USD ($)
Apr. 30, 2020
USD ($)
Aug. 19, 2021
USD ($)
Debt and Financing Arrangements (Textual) [Abstract]          
Debt instrument face amount $ 4,350.0 $ 4,350.0      
Repayment of long-term debt 0.0 1,157.0 $ 700.0    
Short-term borrowings $ 0.0 180.0      
Percentage of the principal amount thereof which company can prepay 100.00%        
Interest paid $ 153.1 155.2 169.9    
Commercial Paper [Member]          
Debt and Financing Arrangements (Textual) [Abstract]          
Commercial paper, borrowing capacity 2,000.0        
Short-term borrowings $ 0.0 $ 180.0      
Commercial paper weighted-average interest rate   0.65%      
Senior Notes [Member]          
Debt and Financing Arrangements (Textual) [Abstract]          
Debt instrument face amount   $ 800.0   $ 800.0  
3.50% Senior Notes due October 15, 2021          
Debt and Financing Arrangements (Textual) [Abstract]          
Repayment of long-term debt   750.0      
3.00% Senior Notes due March 15, 2022          
Debt and Financing Arrangements (Textual) [Abstract]          
Repayment of long-term debt   400.0      
3.00% Senior Notes due March 15, 2022 | Other Nonoperating Income (Expense)          
Debt and Financing Arrangements (Textual) [Abstract]          
Gain (Loss) on Extinguishment of Debt   (6.9)      
Revolving Credit Facility [Member]          
Debt and Financing Arrangements (Textual) [Abstract]          
Number of banks | Bank 11        
Revolving credit facility maximum borrowing capacity $ 2,000.0 2,000.0 $ 1,800.0   $ 1,800.0
Debt issuance costs         $ 4.3
Outstanding balance under revolving credit facility $ 0.0 $ 0.0      
Interest Rate Contracts          
Derivative Instruments, Gain (Loss) [Line Items]          
Deferred pre-tax net gain (loss) included in accumulated other comprehensive loss       $ (239.8)