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Goodwill and Other Intangible Assets - Goodwill (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2015 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Jun. 12, 2014
Goodwill [Line Items] |  |  |  |  |
Goodwill | $ 651.4 | $ 651.4 | $ 780.4 |  |
Period increase (decrease) in goodwill |  | (129.0) |  |  |
Impairment of goodwill |  | (126.6) | $ 0.0 | $ 0.0 |
Goodwill translation adjustments |  | (2.6) |  |  |
Accumulated goodwill impairment | 126.6 | 126.6 |  |  |
Hanard Machine, Inc. [Member] |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill |  |  |  |  | $ 8.4
Goodwill purchase accounting adjustments |  | 0.2 |  |  |
High Performance Materials & Components [Member] |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill | 651.4 | $ 651.4 |  |  |
Flat Rolled Products [Member] |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Impairment of goodwill | $ (126.6) |  |  |  |

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