Derivative Financial Instruments (Tables)

9 Months Ended

Jan. 31, 2014

Derivative Financial Instruments [Abstract]

Fair value of derivative instruments

	January 31, 2014				April 30, 2013
	Other Current Assets		Other Current Liabilities		Other Current Assets		Other Current Liabilities
Derivatives designated as hedging instruments:
Interest rate contract	$	13.7	$	—	$	—	$	—
Commodity contracts		4.6		0.9		2.1		2.0
Total derivatives designated as hedging instruments	$	18.3	$	0.9	$	2.1	$	2.0
Derivatives not designated as hedging instruments:
Commodity contracts	$	6.1	$	3.7	$	3.6	$	2.3
Foreign currency exchange contracts		3.5		0.1		0.7		0.2
Total derivatives not designated as hedging instruments	$	9.6	$	3.8	$	4.3	$	2.5
Total derivative instruments	$	27.9	$	4.7	$	6.4	$	4.5

Commodity contracts gains and losses recognized on derivatives designated as cash flow hedges

	Three Months Ended January 31,				Nine Months Ended January 31,
	2014		2013		2014		2013
Gains (losses) recognized in other comprehensive (loss) income (effective portion)	$	4.5	$	(8.0)	$	(6.1)	$	(23.3)
Losses reclassified from accumulated other comprehensive loss to cost of products sold (effective portion)		(5.7)		(12.0)		(18.4)		(31.0)
Change in accumulated other comprehensive loss	$	10.2	$	4.0	$	12.3	$	7.7
Losses recognized in cost of products sold (ineffective portion)	$	(0.1)	$	(0.4)	$	—	$	(0.6)

Net realized and unrealized gains and losses recognized in cost of products sold on derivatives not designated as qualified hedging instruments

	Three Months Ended January 31,				Nine Months Ended January 31,
	2014		2013		2014		2013
Unrealized gains (losses) on commodity contracts	$	1.8	$	(0.4)	$	4.8	$	8.0
Unrealized gains (losses) on foreign currency exchange contracts		2.2		(0.1)		2.3		0.9
Total unrealized gains (losses) recognized in cost of products sold	$	4.0	$	(0.5)	$	7.1	$	8.9
Realized (losses) gains on commodity contracts	$	(0.9)	$	0.2	$	(7.0)	$	(0.4)
Realized gains (losses) on foreign currency exchange contracts		0.7		0.1		2.5		(0.1)
Total realized (losses) gains recognized in cost of products sold	$	(0.2)	$	0.3	$	(4.5)	$	(0.5)
Total gains (losses) recognized in cost of products sold	$	3.8	$	(0.2)	$	2.6	$	8.4

Outstanding derivative contracts

	January 31, 2014		April 30, 2013
Commodity contracts	$	369.0	$	347.6
Foreign currency exchange contracts		95.1		56.8
Interest rate contract		750.0		—