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Subsequent Event (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended | 0 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 Acero Prime | Oct. 01, 2014 Subsequent event Acero Prime item | Oct. 01, 2014 Subsequent event Acero Prime
Subsequent Event |  |  |  |  |  |  |
Ownership percentage in consolidated subsidiary |  |  |  |  |  |  | 51.00%
Ownership percentage in equity method investment |  |  |  |  | 40.00% |  |
Number of locations with toll processing operations serving customers in the auto industry |  |  |  |  |  | 3 |
Net sales | $ 2,705.1 | $ 2,443.5 | $ 7,874.9 | $ 6,917.1 | $ 23.0 |  |

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