Restructuring (Tables)

9 Months Ended

Jan. 31, 2014

Restructuring [Abstract]

Restructuring and related charges

	Long-Lived Asset Charges		Employee Separation		Site Preparation and Equipment Relocation		Production Start-up		Other Costs		Total
Total expected restructuring charge	$	102.8	$	64.2	$	45.6	$	42.2	$	10.2	$	265.0
Balance at May 1, 2012	$	—	$	8.8	$	—	$	—	$	—	$	8.8
Charge to expense		8.2		3.4		13.4		10.8		3.0		38.8
Cash payments		—		(4.5)		(13.4)		(10.8)		(3.0)		(31.7)
Noncash utilization		(8.2)		—		—		—		—		(8.2)
Balance at April 30, 2013	$	—	$	7.7	$	—	$	—	$	—	$	7.7
Charge to expense		2.7		2.6		5.5		5.5		0.8		17.1
Cash payments		—		(6.1)		(5.5)		(5.5)		(0.8)		(17.9)
Noncash utilization		(2.7)		(0.2)		—		—		—		(2.9)
Balance at January 31, 2014	$	—	$	4.0	$	—	$	—	$	—	$	4.0
Remaining expected restructuring charge	$	0.2	$	0.7	$	7.1	$	10.1	$	2.2	$	20.3