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Restructuring (Tables)

12 Months Ended

Apr. 30, 2015

Restructuring [Abstract]

Restructuring and related charges


		Long-Lived Asset Charges				Employee Separation				Site Preparation and Equipment Relocation				Production Start-up				Other Costs				Total
Total restructuring charge		$	102.7			$	64.0			$	45.5			$	42.2			$	9.4			$	263.8

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				7.2				7.2				1.1				20.8
Cash payments			—				(8.4)				(7.2)				(7.2)				(1.1)				(23.9)
Noncash utilization			(2.7)				(0.2)				—				—				—				(2.9)

Balance at April 30, 2014		$	—			$	1.7			$	—			$	—			$	—			$	1.7
Charge to expense			0.1				0.5				5.3				8.4				1.1				15.4
Cash payments			—				(1.7)				(5.3)				(8.4)				(1.1)				(16.5)
Noncash utilization			(0.1)				—				—				—				—				(0.1)

Balance at April 30, 2015		$	—			$	0.5			$	—			$	—			$	—			$	0.5