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Significant Accounting Policies (Details) In Millions, unless otherwise specified	12 Months Ended				3 Months Ended		12 Months Ended
	Mar. 31, 2014 USD ($)	Mar. 31, 2013 USD ($)	Mar. 31, 2012 USD ($)	Mar. 31, 2012 KRW	Sep. 30, 2013 Error Correction [Member] USD ($)	Jun. 30, 2012 Error Correction [Member] USD ($)	Mar. 31, 2014 Tools [Member] USD ($)	Mar. 31, 2013 Tools [Member] USD ($)
Consolidation principles [Abstract]
Capital contributions			$ 0.9	1,000.0
Investments in non-consolidated affiliated companies (in hundredths)	20.00%
Tooling [Abstract]
Property, plant and equipment, depreciable lives							3 years
Company-owned tooling, net							28.6	30.5
Customer owned tooling receivable							10.3	20.9
Shipping and handling costs [Abstract]
Shipping and handling costs	4.0	4.3	5.4
Research and development [Abstract]
Research and development cost	61.7	68.4	70.2
Trade receivables and allowance for doubtful accounts [Abstract]
Trade receivables, allowance for doubtful accounts	1.1	0.8
Trade receivables sold without recourse	82.4	99.1	113.5
Loss on the sale of accounts receivables	0.3	0.3	0.5
Out of period adjustment [Abstract]
Pre-tax earnings					(0.6)	0.5
After-tax earnings					(0.5)
Cash paid during the year for:
Interest paid	12.6	11.6	12.8
Income taxes paid	$ 11.4	$ 12.4	$ 13.0

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Amount, net of accumulated depreciation, depletion and amortization, of company owned tooling as of the balance sheet date.

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Amount of each individual error being corrected in the correcting adjustment after tax.

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The amount of trade receivables sold without recourse.

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A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Reflects the net positive or negative amount derived from subtracting from net proceeds of sale, the carrying amounts, net of allocated reserves, of accounts receivable transferred to a third party in a transaction that qualifies for sales treatment.

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The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes.

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use.

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Cost incurred during the reporting period in transporting goods and services to customers. Includes freight-out costs.

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