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Business Segments (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Segment Reporting Information [Line Items] |  |
Sales | $ 1,004.8 | $ 979.0
Operating profit (loss) | 61.7 | 96.4
LIFO and net realizable value reserves | (0.1) | 0.0
Corporate expenses | (16.6) | (13.2)
Closed operations and other expenses | (3.1) | (8.1)
Gain on joint venture deconsolidation (See Note 5) | 0.0 | 15.9
Interest expense, net | (24.8) | (25.5)
Income from Continuing Operations before Income Taxes, Noncontrolling Interest | 17.1 | 65.5
Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Sales | 1,051.1 | 1,018.5
Operating Segments | High Performance Materials & Components |  |
Segment Reporting Information [Line Items] |  |
Sales | 623.9 | 579.4
Operating profit (loss) | 72.6 | 85.5
Operating Segments | Flat Rolled Products |  |
Segment Reporting Information [Line Items] |  |
Sales | 427.2 | 439.1
Operating profit (loss) | (10.9) | 10.9
Internal Customers | Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Sales | 46.3 | 39.5
Internal Customers | Operating Segments | High Performance Materials & Components |  |
Segment Reporting Information [Line Items] |  |
Sales | 22.7 | 18.7
Internal Customers | Operating Segments | Flat Rolled Products |  |
Segment Reporting Information [Line Items] |  |
Sales | 23.6 | 20.8
External Customers | Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Sales | 1,004.8 | 979.0
External Customers | Operating Segments | High Performance Materials & Components |  |
Segment Reporting Information [Line Items] |  |
Sales | 601.2 | 560.7
External Customers | Operating Segments | Flat Rolled Products |  |
Segment Reporting Information [Line Items] |  |
Sales | $ 403.6 | $ 418.3

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