Condensed Statements of Consolidated Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Jul. 31, 2015	Jul. 31, 2014
Condensed Statements of Comprehensive Income [Abstract]
Net income	$ 136.4	$ 116.0
Other comprehensive (loss) income:
Foreign currency translation adjustments	(25.5)	(2.8)
Cash flow hedging derivative activity, net of tax	0.1	(4.3)
Pension and other postretirement benefit plans activity, net of tax	4.5	1.4
Available-for-sale securities activity, net of tax	(0.2)	0.4
Total Other Comprehensive Loss	(21.1)	(5.3)
Comprehensive Income	$ 115.3	$ 110.7