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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 ($) employee | Dec. 31, 2016 USD ($) employee | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  | $ 527.2 | $ 64.3 | $ 0.0
Revision of estimates |  |  |  |  |  | (0.4) | (0.2) |
Restructuring reserve | $ 8.1 | $ 33.1 |  |  | $ 8.1 | 33.1 | 8.1 |
Restructuring costs |  |  |  |  |  | 48.8 |  |
Restructuring and other charges |  |  |  |  |  | 538.5 | 89.7 | 0.0
Payments for Restructuring |  |  |  |  |  | (23.8) |  |
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 | $ 23.2
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 costs |  |  | 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 |  | 2.2 |  |  |
Restructuring reserve | 3.6 | 19.2 |  |  | 3.6 | 19.2 | 3.6 |
Restructuring costs |  | 15.4 | 16.3 |  |  | 28.0 |  |
Payments for Restructuring |  |  |  |  |  | (12.4) |  |
Employee benefit costs [Member] |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  | 24.2 |  |
Restructuring costs net of tax |  | 8.6 |  |  |  |  |  |
Restructuring reserve | 4.5 | 13.9 |  |  | 4.5 | 13.9 | $ 4.5 |
Restructuring costs |  | 13.2 |  |  |  | 20.8 |  |
Payments for Restructuring |  |  |  |  |  | $ (11.4) |  |
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 costs |  |  |  | $ 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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