Income Taxes (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Components of (loss) earnings from continuing operations before income taxes [Abstract]
United States	$ 10.2	$ 17.2	$ (27.5)
Foreign	(23.2)	30.7	40.3
(Loss) earnings from continuing operations before income taxes	(13.0)	47.9	12.8
Federal [Abstract]
Current	2.6	0	(3.7)
Deferred	(2.6)	0.3	2.7
State [Abstract]
Current	0.2	0.3	0.2
Deferred	(0.2)	(0.2)	(2.6)
Foreign [Abstract]
Current	6.4	8.3	12.2
Deferred	3.4	1.2	(4.3)
Total income tax expense	9.8	9.9	4.5
Reconciliation of the federal statutory income tax rate to the company's effective income tax rate [Abstract]
Statutory federal tax (in hundredths)	35.00%	35.00%	35.00%
State taxes, net of federal benefit (in hundredths)	(1.30%)	(0.10%)	(19.00%)
Taxes on non-U.S. earnings and losses (in hundredths)	(23.80%)	(5.70%)	(5.70%)
Valuation allowance (in hundredths)	(59.30%)	2.10%	84.60%
Tax credits (in hundredths)	37.00%	(19.20%)	(84.30%)
Compensation (in hundredths)	(13.00%)	3.40%	11.10%
Foreign tax rate changes (in hundredths)	0.90%	0.60%	(4.50%)
Reserve for uncertain tax positions (in hundredths)	(41.90%)	1.90%	4.20%
Brazilian interest on equity (in hundredths)	3.20%	(1.00%)	(7.40%)
Dividend repatriation (in hundredths)	(11.40%)	4.40%	23.00%
Other (in hundredths)	(0.80%)	(0.70%)	(1.80%)
Effective tax rate (in hundredths)	(75.40%)	20.70%	35.20%
Valuation Allowance [Line Items]
Valuation allowance recorded against deferred tax assets	7.7
Period for cumulative loss position	3 years
Development tax credit		4.4	7.8
Deferred tax assets [Abstract]
Accounts receivable	0.6	0.5
Inventories	4.1	4.9
Plant and equipment	13.3	19.0
Pension and employee benefits	85.7	77.4
Net operating loss, capital loss and credit carryforwards	114.6	96.9
Other, principally accrued liabilities	14.2	15.3
Total gross deferred tax assets	232.5	214.0
Less: valuation allowance	(172.8)	(146.8)
Net deferred tax assets	59.7	67.2
Deferred tax liabilities [Abstract]
Pension	34.3	31.2
Goodwill	5.0	5.4
Plant and equipment	11.7	24.2
Other	10.5	7.4
Total gross deferred tax liabilities	61.5	68.2
Net deferred tax liability	(1.8)	(1.0)
Reconciliation of the beginning and ending amount of unrecognized tax benefits [Roll Forward]
Balance, April 1	3.3	5.3
Gross increases - tax positions in prior period	5.6	3.6
Gross decreases - tax positions in prior period	(0.1)	(3.8)
Gross increases - tax positions in current period	0.6	0.5
Gross decreases - tax positions in current period	(0.4)	(0.4)
Settlements	0	(1.7)
Foreign currency impact	0	(0.2)
Balance, March 31	9.0	3.3	5.3
Unrecognized tax benefits that would impact effective tax rate	0.2
Trade tax liability and interest owed		2.0
Accrued interest and penalties	0.2	0.2
Reasonably possible unrecognized tax benefits change	(6.8)
Undistributed foreign earnings [Abstract]
Undistributed earnings remaining foreign operations	453.1
Foreign [Member]
Tax Credit Carryforward [Line Items]
Foreign tax credit carry forwards	5.0
Tax loss credit carryforward, expiration date	2015 and 2017
Federal and State [Member]
Tax Credit Carryforward [Line Items]
Tax credit carryforwards, research and development	17.4
Tax loss credit carryforward, expiration date	2018 and 2033
Foreign [Member]
Operating Loss Carryforwards [Line Items]
Tax loss carryforwards	304.1
Tax losses subject to expiration	199.2
Tax losses not subject to expiration	104.9
Tax loss carryforwards, expiration date	2014 through 2033
Undistributed foreign earnings [Abstract]
Tax on undistributed earnings of certain joint equity investment	0.8
State and Local [Member]
Operating Loss Carryforwards [Line Items]
Tax loss carryforwards	200.5
Tax loss carryforwards, expiration date	2014 through 2033
Austria [Member]
Income Tax Examination [Line Items]
Open tax year for examination by tax jurisdictions	Fiscal 2008 - 2012
Brazil [Member]
Income Tax Examination [Line Items]
Open tax year for examination by tax jurisdictions	Fiscal 2007 - 2012
Germany [Member]
Income Tax Examination [Line Items]
Open tax year for examination by tax jurisdictions	Fiscal 2006 - 2012
United States [Member]
Income Tax Examination [Line Items]
Open tax year for examination by tax jurisdictions	Fiscal 2010 - 2012
Undistributed foreign earnings [Abstract]
Tax on undistributed earnings of certain joint equity investment	0.2
Foreign Tax Jurisdictions [Member]
Valuation Allowance [Line Items]
Valuation allowance recorded against deferred tax assets	15.6
U.S. Taxing Jurisdictions [Member]
Valuation Allowance [Line Items]
Valuation allowance recorded against deferred tax assets	$ (7.9)