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Derivative Financial Instruments - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Apr. 30, 2022
Apr. 30, 2021
Apr. 30, 2020
Apr. 30, 2018
Apr. 30, 2015
Derivative Financial Instruments (Textual) [Abstract]          
Collateral pledged $ 54.6        
Collateral received   $ 10.8      
Cumulative net mark-to-market valuation of certain derivative positions recognized in unallocated derivative gains (losses) 37.3 60.7      
Interest expense – net (160.9) (177.1) $ (189.2)    
Other income (expense) – net (19.1) (37.8) (7.2)    
Amortization of deferred gain on early termination agreement $ 4.0 8.4 8.1    
Commodity contracts          
Derivative Financial Instruments (Textual) [Abstract]          
Derivative instrument maturity 1 year        
Foreign currency exchange contracts          
Derivative Financial Instruments (Textual) [Abstract]          
Derivative instrument maturity 1 year        
Interest rate contract          
Derivative Financial Instruments (Textual) [Abstract]          
Deferred pre-tax net gain (loss) included in accumulated other comprehensive loss     $ (239.8)    
Deferred Gain (Loss) on Cash Flow Hedges Included in Accumulated Other Comprehensive Income or Loss $ (214.2) (227.3)      
Tax impact related to deferred losses and gains on cash flow hedges included in accumulated other comprehensive loss 50.3 $ 52.5      
Effective portion of the hedge loss reclassified to interest expense over the next twelve months (13.5)        
Treasury Lock          
Derivative Financial Instruments (Textual) [Abstract]          
Deferred pre-tax net gain (loss) included in accumulated other comprehensive loss       $ 2.7  
TotalThroughFiscalQ22022          
Derivative Financial Instruments (Textual) [Abstract]          
Amortization of deferred gain on early termination agreement $ 53.5        
Cash [Member] | Interest rate swap [Member] | Fair Value Hedging [Member]          
Derivative Financial Instruments (Textual) [Abstract]          
Gain (loss) on early termination agreement         $ 58.1
Accrued and Prepaid Interest Net | Interest rate swap [Member] | Fair Value Hedging [Member]          
Derivative Financial Instruments (Textual) [Abstract]          
Gain (loss) on early termination agreement         $ 4.6