Debt and Financing Arrangements (Tables)

12 Months Ended

Apr. 30, 2014

Debt and Financing Arrangements [Abstract]

Long-term debt

	Year Ended April 30,
	2014		2013
4.78% Senior Notes due June 1, 2014	$	100.0	$	100.0
6.12% Senior Notes due November 1, 2015		24.0		24.0
6.63% Senior Notes due November 1, 2018		392.0		395.0
3.50% Senior Notes due October 15, 2021		763.8		748.8
5.55% Senior Notes due April 1, 2022		300.0		350.0
4.50% Senior Notes due June 1, 2025		400.0		400.0
Total long-term debt	$	1,979.8	$	2,017.8
Current portion of long-term debt		100.0		50.0
Total long-term debt, less current portion	$	1,879.8	$	1,967.8