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Discontinued Operations - Narrative (Details) (USD $) In Millions, unless otherwise specified |  |  | 6 Months Ended
--- | --- | --- | ---
Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2014 Subsequent Event [Member] Iron Castings Business
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Expected cash exit costs |  |  | $ 3
Restructuring and Related Cost, Expected Cost |  |  | 2
Net assets of discontinued operation | $ 2.9 | $ 4.2 |

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