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Business Segments (Details2) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Segment Reporting Other Significant Reconciling Item [Line Items] |  |  |
Depreciation and amortization | $ 189.9 | $ 176.8 | $ 189.9
Capital expenditures | 144.5 | 225.7 | 612.7
Operating Segments [Member] |  |  |
Segment Reporting Other Significant Reconciling Item [Line Items] |  |  |
Depreciation and amortization | 189.9 | 176.6 | 180.6
Capital expenditures | 144.5 | 225.7 | 607.8
Operating Segments [Member] | High Performance Materials & Components [Member] |  |  |
Segment Reporting Other Significant Reconciling Item [Line Items] |  |  |
Depreciation and amortization | 131.8 | 124.4 | 127.4
Capital expenditures | 75.8 | 51.9 | 39.5
Operating Segments [Member] | Flat Rolled Products [Member] |  |  |
Segment Reporting Other Significant Reconciling Item [Line Items] |  |  |
Depreciation and amortization | 55.6 | 49.3 | 49.5
Capital expenditures | 68.0 | 172.1 | 568.1
Operating Segments [Member] | Corporate [Member] |  |  |
Segment Reporting Other Significant Reconciling Item [Line Items] |  |  |
Depreciation and amortization | 2.5 | 2.9 | 3.7
Capital expenditures | $ 0.7 | $ 1.7 | $ 0.2

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