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Business Segments (Details) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2016 USD ($) segment | Mar. 31, 2015 USD ($)
Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Abstract] |  |
Number of business segments | segment | 2 |
Segment Reporting Information [Line Items] |  |
Sales | $ 757.5 | $ 1,125.5
Operating profit (loss): | (80.5) | 66.1
LIFO and net realizable value reserves | 0.0 | 0.0
Corporate expenses | (11.0) | (12.8)
Closed company and other expenses | (3.5) | (6.0)
Restructuring charges | (9.0) | 0.0
Interest expense, net | (28.3) | (26.7)
Income (loss) before income tax provision (benefit) | (132.3) | 20.6
Restructuring Reserve | 14.0 |
High Performance Materials & Components |  |
Segment Reporting Information [Line Items] |  |
Operating profit (loss): | $ 29.1 | 72.9
Flat Rolled Products |  |
Segment Reporting Information [Line Items] |  |
Restructuring and Related Cost, Expected Number of Positions Eliminated | 250 |
Operating profit (loss): | $ (109.6) | (6.8)
Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Sales | 789.1 | 1,169.6
Operating Segments | High Performance Materials & Components |  |
Segment Reporting Information [Line Items] |  |
Sales | 507.9 | 564.9
Operating Segments | Flat Rolled Products |  |
Segment Reporting Information [Line Items] |  |
Sales | 281.2 | 604.7
Internal Customers | Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Sales | 31.6 | 44.1
Internal Customers | Operating Segments | High Performance Materials & Components |  |
Segment Reporting Information [Line Items] |  |
Sales | 14.9 | 22.1
Internal Customers | Operating Segments | Flat Rolled Products |  |
Segment Reporting Information [Line Items] |  |
Sales | 16.7 | 22.0
External Customers | Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Sales | 757.5 | 1,125.5
External Customers | Operating Segments | High Performance Materials & Components |  |
Segment Reporting Information [Line Items] |  |
Sales | 493.0 | 542.8
External Customers | Operating Segments | Flat Rolled Products |  |
Segment Reporting Information [Line Items] |  |
Sales | $ 264.5 | $ 582.7

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