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Business Segments (Details2) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Segment Reporting Other Significant Reconciling Item [Line Items]      
Depreciation and amortization $ 151.1 $ 156.4 $ 160.8
Capital expenditures 168.2 139.2 122.7
Operating Segments      
Segment Reporting Other Significant Reconciling Item [Line Items]      
Depreciation and amortization 151.1 156.4 160.8
Capital expenditures 168.2 139.2 122.7
Operating Segments | High Performance Materials & Components      
Segment Reporting Other Significant Reconciling Item [Line Items]      
Depreciation and amortization 99.1 106.5 109.3
Capital expenditures 132.5 79.8 62.7
Operating Segments | Flat Rolled Products      
Segment Reporting Other Significant Reconciling Item [Line Items]      
Depreciation and amortization 49.1 47.0 45.6
Capital expenditures 34.8 56.4 59.1
Operating Segments | Corporate [Member]      
Segment Reporting Other Significant Reconciling Item [Line Items]      
Depreciation and amortization 2.9 2.9 5.9
Capital expenditures $ 0.9 $ 3.0 $ 0.9