Pensions and Other Postretirement Benefits (Details 5) (USD $) In Millions, unless otherwise specified	12 Months Ended
Apr. 30, 2014	Apr. 30, 2013	Apr. 30, 2012
Changes in plan assets:
Company contributions	$ 9.4	$ 40.0	$ 11.4
Canadian Defined Benefit Plans [Member]
Company's Canadian pension and other postretirement benefit plans
Benefit obligation at end of year	113.3	125.7
Fair value of plan assets at end of year	105.6	107.1
Funded status of the plans	(7.7)	(18.6)
Components of net periodic benefit cost:
Service cost	0.5	1.3
Interest cost	4.2	5.0
Expected return on plan assets	(5.8)	(6.2)
Amortization of net actuarial loss	1.3	1.7
Net periodic benefit cost	0.2	1.8
Changes in plan assets:
Company contributions	5.4	5.0
Participant contributions	0.1	0.4
Benefits paid	(8.6)	(9.4)
Actual return on plan assets	10.6	8.7
Foreign currency translation	(8.9)	(2.1)
Canadian Other Postretirement Benefit Plans [Member]
Company's Canadian pension and other postretirement benefit plans
Benefit obligation at end of year	11.4	13.5
Fair value of plan assets at end of year	0	0
Funded status of the plans	(11.4)	(13.5)
Components of net periodic benefit cost:
Service cost	0	0
Interest cost	0.5	0.6
Expected return on plan assets	0	0
Amortization of net actuarial loss	0	0
Net periodic benefit cost	0.5	0.6
Changes in plan assets:
Company contributions	0.8	0.9
Participant contributions	0	0
Benefits paid	(0.8)	(0.9)
Actual return on plan assets	0	0
Foreign currency translation	$ 0	$ 0

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The difference between fair value of plan assets at the end of the period and the fair value at the beginning of the period, adjusted for contributions and payments of benefits during the period, and after adjusting for taxes and other expenses, as applicable.

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-Publisher FASB

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The amount of gains or losses recognized in net periodic benefit cost.

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1) For defined benefit pension plans, the benefit obligation is the projected benefit obligation, which is the actuarial present value as of a date of all benefits attributed by the pension benefit formula to employee service rendered prior to that date. 2) For other postretirement defined benefit plans, the benefit obligation is the accumulated postretirement benefit obligation, which is the actuarial present value of benefits attributed to employee service rendered to a particular date.

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The amount of payments made for which participants are entitled under a pension plan, including pension benefits, death benefits, and benefits due on termination of employment. Also includes payments made under a postretirement benefit plan, including prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. This item represents a periodic decrease to the plan obligations and a decrease to plan assets.

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The amount of contributions made by plan participants. This item represents a periodic increase to the plan obligation and an increase to plan assets.

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An amount calculated as a basis for determining the extent of delayed recognition of the effects of changes in the fair value of assets. The expected return on plan assets is determined based on the expected long-term rate of return on plan assets and the market-related value of plan assets.

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Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

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The amount of increase or decrease in plan assets attributed to foreign currency changes. The effects of foreign currency exchange rate changes that are to be disclosed are those applicable to plans of a foreign operation whose functional currency is not the reporting currency.

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The funded status is measured as the difference between the fair value of plan assets and the benefit obligation. Will normally be the same as the net Defined Benefit Plan, Amounts Recognized in Balance Sheet, Total.

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The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time.

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The total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments.

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The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan.

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The amount of cash or cash equivalents contributed by the entity to fund its pension plans.

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