Pensions and Other Postretirement Benefits (Tables)

9 Months Ended

Jan. 31, 2014

Pensions and Other Postretirement Benefits [Abstract]

Net periodic benefit cost

	Three Months Ended January 31,
	Defined Benefit Pension Plans				Other Postretirement Benefits
	2014		2013		2014		2013
Service cost	$	2.2	$	2.2	$	0.6	$	0.6
Interest cost		5.4		6.0		0.6		0.8
Expected return on plan assets		(6.3)		(6.4)		—		—
Recognized net actuarial loss		3.3		3.3		—		—
Other		0.3		0.3		(0.3)		(0.1)
Net periodic benefit cost	$	4.9	$	5.4	$	0.9	$	1.3
	Nine Months Ended January 31,
	Defined Benefit Pension Plans				Other Postretirement Benefits
	2014		2013		2014		2013
Service cost	$	6.6	$	6.8	$	1.7	$	1.8
Interest cost		16.4		18.0		1.7		2.3
Expected return on plan assets		(19.1)		(19.0)		—		—
Recognized net actuarial loss		9.9		9.9		—		—
Settlement loss		—		6.7		—		—
Other		0.9		0.8		(0.8)		(0.2)
Net periodic benefit cost	$	14.7	$	23.2	$	2.6	$	3.9