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Subsequent Events (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2012 | Mar. 31, 2011 | Mar. 31, 2012 Revolving credit facility | Oct. 31, 2011 National Specialty Alloys, LLC
Subsequent Events |  |  |  |
Net sales | $ 2,288.3 | $ 1,912.7 |  | $ 96.0
Borrowings for funding the acquisitions |  |  | $ 101.9 |

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