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Segment and Geographical Area Information, Summary of financial information by operating segment (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Net Sales: |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  | $ 316.6 | $ 336.4 | $ 367.2 | $ 371.7 | $ 338.0 | $ 338.9 | $ 344.1 | $ 335.1 | $ 1,391.9 | $ 1,356.1 | $ 1,297.5
Segment Operating Income (Loss): |  |  |  |  |  |  |  |  |  |  |  |
Total operating income (loss) |  | 35.2 | 40.5 | 37.0 | (458.6) | 26.8 | $ 32.6 | $ 46.4 | $ 32.1 | (345.9) | 137.9 | 173.3
Interest expense |  |  |  |  |  |  |  |  |  | (24.1) | (37.5) | (35.7)
Other income, net |  |  |  |  |  |  |  |  |  | (1.8) | 6.7 | 5.6
Income before income taxes |  |  |  |  |  |  |  |  |  | (371.8) | 107.1 | 143.2
Depreciation and Amortization: |  |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 32.4 | 31.1 | 28.1
Capital expenditures: |  |  |  |  |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  |  |  |  |  | 63.1 | 59.4 | 70.4
Segment assets: |  |  |  |  |  |  |  |  |  |  |  |
Total |  | 1,250.1 |  |  |  | 1,743.7 |  |  |  | 1,250.1 | 1,743.7 |
Non-cash impairment charges |  |  |  |  |  |  |  |  |  | 0.1 | 1.5 | 0.0
Lower of cost or market inventory write-down |  | 2.6 | $ 0.0 | $ 0.0 | $ 0.0 |  |  |  |  | 2.6 | 0.0 | 0.0
Unrealized Gain (Loss) on Derivatives |  |  |  |  |  |  |  |  |  | (3.4) | (6.8) | 3.9
Non-cash defined benefit net periodic benefit cost (income) | [1] |  |  |  |  |  |  |  |  | 2.8 | (23.5) | (22.0)
Loss on removal of Union VEBA net assets – Note 6 |  |  |  |  |  |  |  |  |  | 493.4 | 0.0 | 0.0
Fabricated Products |  |  |  |  |  |  |  |  |  |  |  |
Net Sales: |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  | 1,391.9 | 1,356.1 | 1,297.5
Segment Operating Income (Loss): |  |  |  |  |  |  |  |  |  |  |  |
Total operating income (loss) |  |  |  |  |  |  |  |  |  | 190.8 | 151.4 | 188.6
Depreciation and Amortization: |  |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 31.9 | 30.6 | 27.6
Capital expenditures: |  |  |  |  |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  |  |  |  |  | 62.4 | 58.5 | 69.8
Segment assets: |  |  |  |  |  |  |  |  |  |  |  |
Total |  | 904.8 |  |  |  | 878.9 |  |  |  | 904.8 | 878.9 |
Additional accruals |  |  |  |  |  |  |  |  |  | 1.7 | 1.2 | 4.0
Unrealized Gain (Loss) on Derivatives |  |  |  |  |  |  |  |  |  | (3.4) | (10.4) | 0.7
All Other |  |  |  |  |  |  |  |  |  |  |  |
Segment Operating Income (Loss): |  |  |  |  |  |  |  |  |  |  |  |
Total operating income (loss) |  |  |  |  |  |  |  |  |  | (536.7) | (13.5) | (15.3)
Depreciation and Amortization: |  |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 0.5 | 0.5 | 0.5
Capital expenditures: |  |  |  |  |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  |  |  |  |  | 0.7 | 0.9 | 0.6
Segment assets: |  |  |  |  |  |  |  |  |  |  |  |
Total |  | $ 345.3 |  |  |  | $ 864.8 |  |  |  | 345.3 | 864.8 |
Idled Asset [Member] | Fabricated Products |  |  |  |  |  |  |  |  |  |  |  |
Segment assets: |  |  |  |  |  |  |  |  |  |  |  |
Non-cash impairment charges |  |  |  |  |  |  |  |  |  | 0.1 | 1.5 | 0.0
VEBAs | All Other |  |  |  |  |  |  |  |  |  |  |  |
Segment assets: |  |  |  |  |  |  |  |  |  |  |  |
Non-cash defined benefit net periodic benefit cost (income) |  |  |  |  |  |  |  |  |  | $ 2.4 | $ (23.7) | $ (22.5)
[1] | See Note 6 for the impact of removing the Union VEBA (defined in Note 6) net assets.

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