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Business Segments (Details) $ in Millions | 3 Months Ended
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Mar. 31, 2018 USD ($) segment | Mar. 31, 2017 USD ($)
Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Abstract] |  |
Number of business segments | segment | 2 |
Segment Reporting Information [Line Items] |  |
Sales | $ 979.0 | $ 865.9
Operating profit (loss) | 96.4 | 69.9
LIFO and net realizable value reserves | 0.0 | 0.0
Corporate expenses | (13.2) | (10.3)
Closed operations and other expenses | (8.1) | (3.0)
Gain on joint venture deconsolidation (See Note 5) | 15.9 | 0.0
Interest expense, net | (25.5) | (33.5)
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest | 65.5 | 23.1
Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Sales | 1,018.5 | 896.7
Operating Segments | High Performance Materials & Components |  |
Segment Reporting Information [Line Items] |  |
Sales | 579.4 | 523.7
Operating profit (loss) | 85.5 | 50.9
Operating Segments | Flat Rolled Products |  |
Segment Reporting Information [Line Items] |  |
Sales | 439.1 | 373.0
Operating profit (loss) | 10.9 | 19.0
Internal Customers | Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Sales | 39.5 | 30.8
Internal Customers | Operating Segments | High Performance Materials & Components |  |
Segment Reporting Information [Line Items] |  |
Sales | 18.7 | 13.3
Internal Customers | Operating Segments | Flat Rolled Products |  |
Segment Reporting Information [Line Items] |  |
Sales | 20.8 | 17.5
External Customers | Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Sales | 979.0 | 865.9
External Customers | Operating Segments | High Performance Materials & Components |  |
Segment Reporting Information [Line Items] |  |
Sales | 560.7 | 510.4
External Customers | Operating Segments | Flat Rolled Products |  |
Segment Reporting Information [Line Items] |  |
Sales | $ 418.3 | $ 355.5

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- Definition Business segment operating profit, which excludes costs for restructuring charges, retirement benefit income or expense, corproate expenses, interest expense, debt extinguishment costs and costs associated with closed operations. These costs are excluded for segment reporting to provide a profit measure based on what management considers to be controllable costs at the business segment level + References No definition available. + Details
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- Definition The amount of the gain (loss) recognized by the parent and included in its attributable portion of net income for the period due to deconsolidation of a subsidiary or derecognition of a group of assets. The gain (loss) recognized and included in the net income attributable to the parent for the period is generally computed as the difference between: (a) the aggregate of: (1) the fair value of any consideration received; (2) the fair value of any retained noncontrolling investment in the former subsidiary at the date the subsidiary was deconsolidated; and (3) the carrying amount of any noncontrolling interest in the former subsidiary (including any accumulated other comprehensive income attributable to the noncontrolling interest) at the date the subsidiary was deconsolidated and (b) the carrying amount of the former subsidiary's assets and liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1B -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84161450&loc=SL4582445-111684 + Details
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- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References No definition available. + Details
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