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Derivative Financial Instruments (Details Textual) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Oct. 31, 2019
Oct. 31, 2018
Oct. 31, 2019
Oct. 31, 2018
Apr. 30, 2018
Apr. 30, 2015
Apr. 30, 2019
Nov. 30, 2018
Jun. 30, 2018
Derivative Financial Instruments (Textual) [Abstract]                  
Interest expense – net $ (49.1) $ (53.6) $ (98.5) $ (107.2)          
Amortization of deferred gain on early termination agreement 2.1   4.1            
Derivative Financial Instruments (Additional Textual) [Abstract]                  
Cash margin accounts related to derivative instruments recognized 8.6   8.6       $ 40.7    
Cumulative net mark-to-market valuation of certain derivative positions recognized in unallocated derivative gains (losses)     $ (22.6)   $ (52.5)        
Commodity contracts                  
Derivative Financial Instruments (Textual) [Abstract]                  
Derivative instrument maturity     1 year            
Gross notional amount 432.8   $ 432.8       544.8    
Foreign currency exchange contracts                  
Derivative Financial Instruments (Textual) [Abstract]                  
Derivative instrument maturity     1 year            
Gross notional amount 93.9   $ 93.9       144.9    
Interest rate contracts                  
Derivative Financial Instruments (Textual) [Abstract]                  
Gross notional amount 800.0   800.0       800.0 $ 300.0 $ 500.0
Deferred pre-tax gain (loss) included in accumulated other comprehensive loss (149.4)   (149.4)       (52.5)    
Tax impact related to deferred losses and gains on cash flow hedges included in accumulated other comprehensive loss $ 34.4   34.4       $ 12.1    
Effective portion of the hedge loss reclassified to interest expense over the next twelve months     (5.6)            
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax     (146.2)            
Total Through Q2 2020 [Member]                  
Derivative Financial Instruments (Textual) [Abstract]                  
Amortization of deferred gain on early termination agreement     37.1            
2020 [Member]                  
Derivative Financial Instruments (Textual) [Abstract]                  
Amortization of deferred gain on early termination agreement     4.0            
2021 [Member]                  
Derivative Financial Instruments (Textual) [Abstract]                  
Amortization of deferred gain on early termination agreement     8.4            
2022 [Member]                  
Derivative Financial Instruments (Textual) [Abstract]                  
Amortization of deferred gain on early termination agreement     $ 4.0            
Cash [Member] | Interest rate swap | Fair Value Hedging [Member]                  
Derivative Financial Instruments (Textual) [Abstract]                  
Gain (loss) on early termination agreement           $ 58.1      
Accrued and Prepaid Interest, Net [Member] | Interest rate swap | Fair Value Hedging [Member]                  
Derivative Financial Instruments (Textual) [Abstract]                  
Gain (loss) on early termination agreement           $ (4.6)