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Derivative Financial Instruments (Details 4) - Cash Flow Hedging [Member] - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jan. 31, 2022
Jan. 31, 2021
Jan. 31, 2022
Jan. 31, 2021
Derivative Instruments, Gain (Loss) [Line Items]        
Gains (losses) recognized in other comprehensive income (loss) $ 0.0 $ 0.0 $ 0.0 $ 0.0
Change in accumulated other comprehensive income (loss) 3.4 3.5 9.8 10.4
Interest Expense [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Gains (losses) reclassified from accumulated other comprehensive income (loss) [1] (3.4) (3.5) (10.4) (10.4)
Other Nonoperating Income (Expense)        
Derivative Instruments, Gain (Loss) [Line Items]        
Gains (losses) reclassified from accumulated other comprehensive income (loss) [2] $ 0.0 $ 0.0 $ 0.6 $ 0.0
[1] Interest expense – net, as presented in the Condensed Statements of Consolidated Income was $39.5 and $43.5 for the three months ended January 31, 2022 and 2021, respectively, and was $122.9 and $134.7 for the nine months ended January 31, 2022 and 2021, respectively.
[2] Other expense – net, as presented in the Condensed Statements of Consolidated Income was $1.5 and $1.2 for the three months ended January 31, 2022 and 2021, respectively, and was $15.3 and $34.8 for the nine months ended January 31, 2022 and 2021, respectively. The reclassification is related to the debt extinguishment during the first quarter of 2022, as discussed in Note 8: Debt and Financing Arrangements.