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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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