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Business Segments (Details2) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Segment Reporting Other Significant Reconciling Item [Line Items] |  |  |
Depreciation and amortization | $ 170.3 | $ 189.9 | $ 176.8
Capital expenditures | 202.2 | 144.5 | 225.7
Operating Segments [Member] |  |  |
Segment Reporting Other Significant Reconciling Item [Line Items] |  |  |
Depreciation and amortization | 170.3 | 189.9 | 176.6
Capital expenditures | 202.2 | 144.5 | 225.7
Operating Segments [Member] | High Performance Materials & Components [Member] |  |  |
Segment Reporting Other Significant Reconciling Item [Line Items] |  |  |
Depreciation and amortization | 118.4 | 131.8 | 124.4
Capital expenditures | 89.9 | 75.8 | 51.9
Operating Segments [Member] | Flat Rolled Products [Member] |  |  |
Segment Reporting Other Significant Reconciling Item [Line Items] |  |  |
Depreciation and amortization | 48.8 | 55.6 | 49.3
Capital expenditures | 111.8 | 68.0 | 172.1
Operating Segments [Member] | Corporate [Member] |  |  |
Segment Reporting Other Significant Reconciling Item [Line Items] |  |  |
Depreciation and amortization | 3.1 | 2.5 | 2.9
Capital expenditures | $ 0.5 | $ 0.7 | $ 1.7

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