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Business Segments (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Segment Reporting Information [Line Items] |  |  |  |
Sales | $ 1,080.4 | $ 1,009.5 | $ 2,085.2 | $ 1,988.5
Operating profit (loss) | 114.5 | 124.0 | 176.2 | 220.4
LIFO and net realizable value reserves | 0.0 | 0.0 | (0.1) | 0.0
Corporate expenses | (18.0) | (12.9) | (34.6) | (26.1)
Closed operations and other expenses | (7.9) | (5.1) | (11.0) | (13.2)
Gain on joint venture deconsolidation | 0.0 | 0.0 | 0.0 | 15.9
Gain on asset sales, net | 21.6 | 0.0 | 21.6 | 0.0
Interest expense, net | (25.9) | (25.5) | (50.7) | (51.0)
Income from Continuing Operations before Income Taxes, Noncontrolling Interest | 84.3 | 80.5 | 101.4 | 146.0
Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales | 1,135.6 | 1,051.0 | 2,186.7 | 2,069.5
Operating Segments | High Performance Materials & Components |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales | 673.8 | 611.7 | 1,297.7 | 1,191.1
Operating profit (loss) | 98.9 | 97.9 | 171.5 | 183.4
Operating Segments | Flat Rolled Products |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales | 461.8 | 439.3 | 889.0 | 878.4
Operating profit (loss) | 15.6 | 26.1 | 4.7 | 37.0
Internal Customers | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales | 55.2 | 41.5 | 101.5 | 81.0
Internal Customers | Operating Segments | High Performance Materials & Components |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales | 31.4 | 19.8 | 54.1 | 38.5
Internal Customers | Operating Segments | Flat Rolled Products |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales | 23.8 | 21.7 | 47.4 | 42.5
External Customers | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales | 1,080.4 | 1,009.5 | 2,085.2 | 1,988.5
External Customers | Operating Segments | High Performance Materials & Components |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales | 642.4 | 591.9 | 1,243.6 | 1,152.6
External Customers | Operating Segments | Flat Rolled Products |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales | $ 438.0 | $ 417.6 | $ 841.6 | $ 835.9

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