Derivative Financial Instruments (Details 4) - Cash Flow Hedging [Member] - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Oct. 31, 2022	Oct. 31, 2021	Oct. 31, 2022	Oct. 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)		3.5	3.5	6.8	6.4
Interest Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) reclassified from accumulated other comprehensive income (loss)	[1]	(3.5)	(3.5)	(6.8)	(7.0)
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 $39.7 and $40.3 for the three months ended October 31, 2022 and 2021, respectively, and $78.8 and $83.4 for the six months ended October 31, 2022 and 2021, respectively.

[2] Other income (expense) – net, as presented in the Condensed Statements of Consolidated Income was expense of $0.8 and $2.7 for the three months ended October 31, 2022 and 2021, respectively, and expense of $0.3 and $13.8 for the six months ended October 31, 2022 and 2021, respectively. The reclassification during the first quarter of 2022 is related to the debt extinguishment of the $400.0 Senior Notes due March 15, 2022.