Derivative Financial Instruments (Details 4) - Cash Flow Hedging [Member] - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Jan. 31, 2023	Jan. 31, 2022	Jan. 31, 2023	Jan. 31, 2022
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	3.4	10.2	9.8
Interest Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) reclassified from accumulated other comprehensive income (loss)	[1]	(3.4)	(3.4)	(10.2)	(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	$ 0.0	$ 0.6

[1] Interest expense – net, as presented in the Condensed Statements of Consolidated Income was $37.9 and $39.5 for the three months ended January 31, 2023 and 2022, respectively, and $116.7 and $122.9 for the nine months ended January 31, 2023 and 2022, respectively.

[2] Other income (expense) – net, as presented in the Condensed Statements of Consolidated Income was expense of $4.6 and $1.5 for the three months ended January 31, 2023 and 2022, respectively, and expense of $4.9 and $15.3 for the nine months ended January 31, 2023 and 2022, respectively. The reclassification during the nine months ended January 31, 2022, is related to the debt extinguishment of the $400.0 Senior Notes due March 15, 2022.