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Restructuring Costs (Details) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2015 USD ($) | Dec. 31, 2016 USD ($) | Sep. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) employee | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) employee | Dec. 31, 2015 USD ($)
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  | $ 0.0 | $ 527.2 | $ 64.3
Revision of estimates |  |  |  |  |  | 0.1 | (0.4) |
Restructuring and other charges |  |  |  |  |  | 0.0 | 538.5 | 89.7
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance |  |  |  | $ 8.1 |  | 33.1 | 8.1 |
Additions |  |  |  |  |  |  | 48.8 |
Reversals |  |  |  |  |  | (2.7) |  |
Payments |  |  |  |  |  | (28.8) | (23.8) |
Ending balance | $ 8.1 | $ 33.1 |  |  | $ 8.1 | 1.6 | 33.1 | 8.1
Inventory Valuation Reserve [Member] | Non-PQ grade titanium sponge [Member] |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Inventory valuation charges |  |  |  |  | 25.4 |  |  |
Inventory Valuation Reserve [Member] | Industrial titanium products [Member] |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Inventory valuation charges |  |  |  |  |  |  | 17.7 | 24.5
Long-lived asset impairment [Member] |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  |  | 471.3 |
Restructuring costs net of tax |  |  | $ 310.3 |  |  |  |  |
Asset Impairment Charges |  |  |  |  |  |  |  | 54.5
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |  |
Additions |  |  | 471.3 |  |  |  |  |
Facility Closing [Member] |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring charges |  |  |  |  | 3.5 |  | 31.7 |
Restructuring costs net of tax |  | 10.0 | 10.7 |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance |  |  |  | 3.6 |  | 19.2 | 3.6 |
Additions |  | 15.4 | 16.3 |  |  |  | 28.0 |
Reversals |  |  |  |  |  | (1.1) |  |
Payments |  |  |  |  |  | (17.3) | (12.4) |
Ending balance | 3.6 | 19.2 |  |  | 3.6 | 0.8 | 19.2 | 3.6
Employee benefit costs [Member] |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  |  | 24.2 |
Restructuring costs net of tax |  | 8.6 |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance |  |  |  | 4.5 |  | 13.9 | 4.5 |
Additions |  | 13.2 |  |  |  |  | 20.8 |
Reversals |  |  |  |  |  | (1.6) |  |
Payments |  |  |  |  |  | (11.5) | (11.4) |
Ending balance | 4.5 | 13.9 |  |  | 4.5 | $ 0.8 | $ 13.9 | $ 4.5
Flat Rolled Products [Member] |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring and Related Cost, Expected Number of Positions Eliminated | employee |  |  |  |  |  |  | 250 |
Flat Rolled Products [Member] | Facility Closing [Member] |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  |  | $ 8.4 |
Flat Rolled Products [Member] | Employee benefit costs [Member] |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  |  | 4.9 |
Flat Rolled Products [Member] | Special Termination Benefits [Member] |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  |  | 3.4 |
Flat Rolled Products [Member] | Employee Severance [Member] |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  |  | $ 11.8 |
Restructuring costs net of tax |  |  |  | 6.7 |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |  |  |
Additions |  |  |  | $ 9.0 |  |  |  |
High Performance Materials & Components and Corporate [Member] |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Severance and termination benefit costs |  |  |  |  | $ 6.3 |  |  |
Number of employees affected by restructuring | employee |  |  |  |  | 100 |  |  |
High Performance Materials & Components [Member] |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring and Related Cost, Expected Number of Positions Eliminated | employee |  |  |  |  |  |  | 180 |
High Performance Materials & Components [Member] | Facility Closing [Member] |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  |  | $ 23.8 |
High Performance Materials & Components [Member] | Employee benefit costs [Member] |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  |  | 7.5 |
Rowley, UT facility [Member] |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Asset Impairment Charges |  |  | $ 470.8 |  |  |  |  |
Estimated fair value after impairment |  | $ 15.0 |  |  |  |  | $ 15.0 |
Midland, Pennsylvania Facility [Member] | Flat Rolled Products [Member] |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Asset Impairment Charges | 24.2 |  |  |  |  |  |  |
Grain-Oriented Electrical Steel (GOES) Operations in Western Pennsylvania [Member] | Flat Rolled Products [Member] |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Asset Impairment Charges | $ 30.3 |  |  |  |  |  |  |

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