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Inventories (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2014 | Mar. 31, 2013 | Dec. 31, 2013
Inventory Disclosure [Abstract] |  |  |
Raw materials and supplies | $ 291.2 |  | $ 277.6
Work-in-process | 1,069.3 |  | 984.9
Finished goods | 161.3 |  | 162.1
Total inventories at current cost | 1,521.8 |  | 1,424.6
Adjustment from current cost to LIFO cost basis | 20.4 |  | 29.4
Inventory valuation reserves | (73.7) |  | (84.3)
Progress payments | (60.0) |  | (47.6)
Total inventories, net | 1,408.5 |  | 1,322.1
Inventory [Line Items] |  |  |
Lifo Provision Benefit | 9.0 | 0.5 |
Change in inventory valuation reserve | (9.0) |  |
Flat Rolled Products |  |  |
Inventory [Line Items] |  |  |
Change in inventory valuation reserve | $ 8.3 |  |

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- Definition Amount before valuation and LIFO reserves of completed merchandise or goods expected to be sold within one year or operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 6 -Subparagraph a -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.6(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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