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Business Segments (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Segment Reporting Information [Line Items] |  |  |  |
Sales | $ 1,018.7 | $ 1,020.2 | $ 3,103.9 | $ 3,008.7
Operating profit (loss) | 99.2 | 105.5 | 275.4 | 325.9
LIFO and net realizable value reserves | 0.0 | 0.0 | (0.1) | 0.0
Corporate expenses | (16.0) | (14.8) | (50.6) | (40.9)
Closed operations and other expenses | (8.2) | (3.4) | (19.2) | (16.6)
Gain on joint venture deconsolidation | 0.0 | 0.0 | 0.0 | 15.9
Gain on asset sales, net | 68.2 | 0.0 | 89.8 | 0.0
Interest expense, net | (24.2) | (24.8) | (74.9) | (75.8)
Income from Continuing Operations before Income Taxes, Noncontrolling Interest | 119.0 | 62.5 | 220.4 | 208.5
Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales | 1,069.4 | 1,067.7 | 3,256.1 | 3,137.2
Operating Segments | High Performance Materials & Components |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales | 577.3 | 615.2 | 1,875.0 | 1,806.3
Operating profit (loss) | 78.8 | 76.0 | 250.3 | 259.4
Operating Segments | Flat Rolled Products |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales | 492.1 | 452.5 | 1,381.1 | 1,330.9
Operating profit (loss) | 20.4 | 29.5 | 25.1 | 66.5
Internal Customers | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales | 50.7 | 47.5 | 152.2 | 128.5
Internal Customers | Operating Segments | High Performance Materials & Components |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales | 25.6 | 29.7 | 79.7 | 68.2
Internal Customers | Operating Segments | Flat Rolled Products |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales | 25.1 | 17.8 | 72.5 | 60.3
External Customers | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales | 1,018.7 | 1,020.2 | 3,103.9 | 3,008.7
External Customers | Operating Segments | High Performance Materials & Components |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales | 551.7 | 585.5 | 1,795.3 | 1,738.1
External Customers | Operating Segments | Flat Rolled Products |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales | $ 467.0 | $ 434.7 | $ 1,308.6 | $ 1,270.6

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