Pension and Employee Benefit Plans (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Defined Benefit Plan Disclosure [Line Items]
Portion of employee contribution matched (in hundredths)	50.00%	50.00%	50.00%
Contribution by employee (in hundredths)	5.00%	5.00%	5.00%
Defined contribution plan cost recognized	$ 8.3	$ 4.1	$ 4.4
Pension Plans [Member]
Change in benefit obligation [Roll Forward]
Benefit obligation at beginning of year	309.6	281.8
Service cost	0.6	0.6	1.4
Interest cost	13.0	13.5	13.9
Actuarial (gain) loss	(10.8)	27.1
Benefits paid	(18.6)	(12.6)
Effect of exchange rate changes	1.9	(0.8)
Benefit obligation at end of year	295.7	309.6	281.8
Change in plan assets [Roll Forward]
Fair value of plan assets at beginning of year	200.6	186.6
Actual return on plan assets	22.2	16.2
Benefits paid	(18.6)	(12.6)
Employer contributions	9.5	10.4
Fair value of plan assets at end of year	213.7	200.6	186.6
Funded status at end of year	(82.0)	(109.0)
Amounts recognized in the consolidated balance sheets [Abstract]
Current liability	(1.0)	(1.0)
Noncurrent liability	(81.0)	(108.0)
Total liability	(82.0)	(109.0)
Amounts recognized in accumulated other comprehensive loss [Abstract]
Net actuarial loss (gain)	153.4	176.4
Prior service credit	0	0
Total	153.4	176.4
Pension plans with accumulated benefit obligations in excess of plan assets [Abstract]
Accumulated benefit obligation	293.0	307.2
Components of net periodic benefit costs [Abstract]
Service cost	0.6	0.6	1.4
Interest cost	13.0	13.5	13.9
Expected return on plan assets	(15.7)	(16.1)	(15.7)
Amortization of [Abstract]
Unrecognized net loss (gain)	6.3	5.0	7.0
Unrecognized prior service credit	0	0	0
Adjustment for curtailment	0	0	0
Net periodic benefit cost (income)	4.2	3.0	6.6
Other changes in plan assets and benefit obligation recognized in other comprehensive (income) loss [Abstract]
Net actuarial (gain) loss	(17.3)	27.0	45.7
Prior service costs	0	0	0
Reversal of amortization items [Abstract]
Net actuarial (gain) loss	(6.3)	(5.0)	(7.0)
Prior service costs	0	0	0
Total recognized in other comprehensive (income) loss	(23.6)	22.0	38.7
Estimated net actuarial loss that will be amortized	5.4
Estimated future benefit payments [Abstract]
Anticipated contributions for 2015 fiscal year	9.5
2015	15.6
2016	15.7
2017	16.2
2018	17.6
2019	18.0
2020-2024	95.3
Postretirement Plans [Member]
Change in benefit obligation [Roll Forward]
Benefit obligation at beginning of year	7.5	7.2
Service cost	0.1	0.1	0
Interest cost	0.2	0.3	0.4
Actuarial (gain) loss	(1.4)	0.1
Benefits paid	(0.5)	(0.2)
Effect of exchange rate changes	0	0
Benefit obligation at end of year	5.9	7.5	7.2
Change in plan assets [Roll Forward]
Fair value of plan assets at beginning of year	0	0
Actual return on plan assets	0	0
Benefits paid	(0.5)	(0.2)
Employer contributions	0.5	0.2
Fair value of plan assets at end of year	0	0	0
Funded status at end of year	(5.9)	(7.5)
Amounts recognized in the consolidated balance sheets [Abstract]
Current liability	(0.5)	(0.8)
Noncurrent liability	(5.4)	(6.7)
Total liability	(5.9)	(7.5)
Amounts recognized in accumulated other comprehensive loss [Abstract]
Net actuarial loss (gain)	(1.7)	(0.3)
Prior service credit	(0.2)	(1.5)
Total	(1.9)	(1.8)
Components of net periodic benefit costs [Abstract]
Service cost	0.1	0.1	0
Interest cost	0.2	0.3	0.4
Expected return on plan assets	0	0	0
Amortization of [Abstract]
Unrecognized net loss (gain)	(0.1)	0	0
Unrecognized prior service credit	(1.2)	(1.5)	(1.7)
Adjustment for curtailment	0	0	(0.3)
Net periodic benefit cost (income)	(1.0)	(1.1)	(1.6)
Other changes in plan assets and benefit obligation recognized in other comprehensive (income) loss [Abstract]
Net actuarial (gain) loss	(1.4)	0	0.7
Prior service costs	0	0	0.3
Reversal of amortization items [Abstract]
Net actuarial (gain) loss	0.1	0.1	0
Prior service costs	1.2	1.5	1.7
Total recognized in other comprehensive (income) loss	(0.1)	1.6	2.7
Estimated prior service credit that will be amortized	0.2
Assumed healthcare cost trend rates [Abstract]
Healthcare costs trend rate	7.30%	7.50%
Ultimate trend rate (in hundredths)	5.00%	5.00%
Year the rate reaches the ultimate trend rate	2019	2019
Effect of one percentage point change in assumed health care cost trend rates [Abstract]
Effect on total of service and interest cost on one percentage point increase	0.1
Effect on total of service and interest cost on one percentage point decrease	0.1
Effect on postretirement benefit obligation for one percentage point increase	0.1
Effect on postretirement benefit obligation for one percentage point decrease	(0.1)
U.S. Pension Plans [Member]
Change in plan assets [Roll Forward]
Fair value of plan assets at beginning of year	200.6
Employer contributions	8.0	9.2	11.5
Fair value of plan assets at end of year	$ 213.7	$ 200.6
Weighted-average assumptions used in calculating benefit obligation [Abstract]
Discount rate (in hundredths)	4.70%	4.40%
Weighted-average assumptions used in calculating costs under the plan [Abstract]
Discount rate (in hundredths)	4.40%	4.90%	5.80%
Expected return on plan assets (in hundredths)	8.00%	8.00%	8.00%
Defined Benefit Plan, Information about Plan Assets [Abstract]
Target allocation (in hundredths)	100.00%
Plan assets (in hundredths)	100.00%	100.00%
Expected return on plan assets for next fiscal year (in hundredths)	8.00%
U.S. Pension Plans [Member] \| Equity Securities [Member]
Defined Benefit Plan, Information about Plan Assets [Abstract]
Target allocation (in hundredths)	55.00%
Plan assets (in hundredths)	57.00%	57.00%
U.S. Pension Plans [Member] \| Debt Securities [Member]
Defined Benefit Plan, Information about Plan Assets [Abstract]
Target allocation (in hundredths)	38.00%
Plan assets (in hundredths)	37.00%	37.00%
U.S. Pension Plans [Member] \| Alternative Assets [Member]
Defined Benefit Plan, Information about Plan Assets [Abstract]
Target allocation (in hundredths)	5.00%
Plan assets (in hundredths)	5.00%	5.00%
U.S. Pension Plans [Member] \| Cash [Member]
Defined Benefit Plan, Information about Plan Assets [Abstract]
Target allocation (in hundredths)	2.00%
Plan assets (in hundredths)	1.00%	1.00%
Foreign Pension Plans [Member]
Weighted-average assumptions used in calculating benefit obligation [Abstract]
Discount rate (in hundredths)	3.00%	3.50%
Weighted-average assumptions used in calculating costs under the plan [Abstract]
Discount rate (in hundredths)	3.50%	5.00%	5.80%
U.S. Postretirement Plans [Member]
Weighted-average assumptions used in calculating benefit obligation [Abstract]
Discount rate (in hundredths)	4.30%	3.70%
Weighted-average assumptions used in calculating costs under the plan [Abstract]
Discount rate (in hundredths)	3.70%	4.40%	5.40%

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An assumption as to the rate of return for next fiscal year on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation.

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Employee contribution for which the employer contributes a matching contribution to a defined contribution plan.

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The pretax total of net gain (loss), prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost.

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The pretax net amount of gains and losses that are not yet recognized as a component of net periodic benefit cost, and that are recognized as increases or decreases in other comprehensive income as they arise. Gains and losses are due to changes in the value of either the benefit obligation or the plan assets resulting from experience different from that assumed or from a change in an actuarial assumption, or the consequence of a decision to temporarily deviate from the substantive plan.

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Amount related to the pretax cost of benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation, which has not yet been recognized as components of net periodic benefit cost.

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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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Amount of gain (loss) related to change in benefit obligation resulting from changes in actuarial assumptions, for example, but not limited to, interest, mortality, employee turnover, salary, and temporary deviation from the substantive plan.

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

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The amount of the prior service cost or credit recognized in net periodic benefit cost relating to benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation.

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The aggregate net amount recognized in the balance sheet associated with the defined benefit plan(s). Will normally be the same as the Defined Benefit Plan, Funded Status of Plan, Total.

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The interest rate used to adjust for the time value of money for the plan.

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The interest rate used to adjust for the time value of money.

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An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation.

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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 increase in the fair value of plan assets from contributions made by the employer.

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Amount of effect of a one-percentage-point decrease in the assumed health care cost trend rates on the accumulated postretirement benefit obligation for health care benefits.

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Amount of effect of a one-percentage-point decrease in the assumed health care cost trend rates on the aggregate of the service and interest cost components of net periodic postretirement health care benefit costs.

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The effect of a one-percentage-point increase in the assumed health care cost trend rates on the accumulated postretirement benefit obligation for health care benefits.

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The effect of a one-percentage-point increase in the assumed health care cost trend rates on the aggregate of the service and interest cost components of net periodic postretirement health care benefit costs.

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Amount of benefits expected to be paid in the five fiscal years after the fifth fiscal year following the latest fiscal year from a defined benefit plan.

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Amount of benefits expected to be paid in the next fiscal year following the latest fiscal year from a defined benefit plan.

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Amount of benefits expected to be paid in the fifth fiscal year following the latest fiscal year from a defined benefit plan.

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Amount of benefits expected to be paid in the fourth fiscal year following the latest fiscal year from a defined benefit plan.

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Amount of benefits expected to be paid in the third fiscal year following the latest fiscal year from a defined benefit plan.

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Amount of benefits expected to be paid in the second fiscal year following the latest fiscal year from a defined benefit plan.

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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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Amount of gain (loss) from foreign currency exchange rate changes for benefit obligation for 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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Amount included in accumulated other comprehensive income (AOCI) related to gain (loss) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position.

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No definition available.

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Amount included in accumulated other comprehensive income (AOCI) related to prior service cost (credit) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position.

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The assumed health care cost trend rate for the next year used to measure the expected cost of benefits covered by the plan (gross eligible charges). This is based upon the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan population by age and dependency status.

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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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If aggregate disclosures are presented, the aggregate pension accumulated benefit obligation for pension plans with accumulated benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented.

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Amount of net gain (loss) recognized in net periodic benefit cost due to settlements and curtailments. Curtailments result from an event that significantly reduces the expected years of future service of present employees or eliminates for a significant number of employees the accrual of defined benefits for some or all of their future services. Settlements result from an irrevocable action that relieves the employer (or the plan) of primary responsibility for a benefit obligation and eliminates significant risks related to the obligation and the assets used to effect the settlement. Examples of transactions that constitute a settlement include, but are not limited to, lump-sum cash payments to plan participants in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contracts to cover vested benefits.

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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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Amount of employer's best estimate of contributions expected to be paid to the plan during the next fiscal year beginning after the date of the latest statement of financial position.

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Target allocation of investments of this type to total plan assets presented on a weighted average basis.

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The ultimate trend rate for health care costs.

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Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held.

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Year the ultimate health care cost trend rate is expected to be reached, in CCYY format.

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The amount of the cost recognized during the period for defined contribution plans.

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Amount before tax of cost (credit) of benefit changes attributable to plan participants' prior service resulting from a plan amendment or plan initiation that has not been recognized in net periodic benefit cost (credit).

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Amount before tax of reclassification adjustment from accumulated other comprehensive (income) loss for prior service cost (credit) related to pension and other postretirement benefit plans.

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Amount before tax, after reclassification adjustments, of (increase) decrease in accumulated other comprehensive (income) loss related to pension and other postretirement defined benefit plans.

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Amount before tax of (increase) decrease in the value of the projected benefit obligation related to a change in an actuarial assumption and increase (decrease) in the value of the plan assets resulting from experience different from that assumed, that has not been recognized in net periodic benefit (cost) credit.

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Amount before tax of reclassification adjustment from accumulated other comprehensive income (loss) for actuarial gain (loss) related to pension and other postretirement benefit plans.

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For a classified balance sheet, the amount recognized in balance sheet as a current liability associated with an underfunded defined benefit plan.

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This represents the noncurrent liability for underfunded plans recognized in the balance sheet that is associated with the defined benefit pension plans and other postretirement defined benefit plans.

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