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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, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |  |
Impairment of Intangible Assets |  |  | $ 2.6 |  |  |  |  |  |  |  |  |
Net Sales: |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  | $ 331.9 | 320.6 | $ 334.9 | $ 343.2 | $ 316.6 | $ 336.4 | $ 367.2 | $ 371.7 | $ 1,330.6 | $ 1,391.9 | $ 1,356.1
Segment Operating Income (Loss): |  |  |  |  |  |  |  |  |  |  |  |
Total operating income (loss) |  | 45.3 | 29.8 | 57.9 | 44.8 | 35.2 | 40.5 | 37.0 | (458.6) | 177.8 | (345.9) | 137.9
Interest expense |  |  |  |  |  |  |  |  |  | (20.3) | (24.1) | (37.5)
Other income, net |  |  |  |  |  |  |  |  |  | (10.3) | (1.8) | 6.7
Income (loss) before income taxes |  |  |  |  |  |  |  |  |  | 147.2 | (371.8) | 107.1
Depreciation and Amortization: |  |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 36.0 | 32.4 | 31.1
Capital expenditures: |  |  |  |  |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  |  |  |  |  | 76.1 | 63.1 | 59.4
Segment assets: |  |  |  |  |  |  |  |  |  |  |  |
Total |  | 1,443.5 |  |  |  | 1,246.9 |  |  |  | 1,443.5 | 1,246.9 |
Non-cash impairment charges |  |  |  |  |  |  |  |  |  | 2.8 | 0.1 | 1.5
Lower of cost or market inventory write-down |  | 0.0 | $ 0.0 | $ 0.0 | $ 4.9 | 2.6 | $ 0.0 | $ 0.0 | $ 0.0 | 4.9 | 2.6 | 0.0
Unrealized Gain (Loss) on Derivatives |  |  |  |  |  |  |  |  |  | 18.7 | (3.4) | (6.8)
Net periodic postretirement benefit cost (income) relating to VEBAs |  |  |  |  |  |  |  |  |  | 3.4 | 2.4 | (23.7)
Non-cash defined benefit net periodic benefit cost (income) | [1] |  |  |  |  |  |  |  |  | 3.7 | 2.8 | (23.5)
(Gain) loss on removal of Union VEBA net assets |  |  |  |  |  |  |  |  |  | (0.1) | 493.4 | 0.0
Fabricated Products |  |  |  |  |  |  |  |  |  |  |  |
Net Sales: |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  | 1,330.6 | 1,391.9 | 1,356.1
Segment Operating Income (Loss): |  |  |  |  |  |  |  |  |  |  |  |
Total operating income (loss) |  |  |  |  |  |  |  |  |  | 229.6 | 190.8 | 151.4
Depreciation and Amortization: |  |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 35.4 | 31.9 | 30.6
Capital expenditures: |  |  |  |  |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  |  |  |  |  | 75.6 | 62.4 | 58.5
Segment assets: |  |  |  |  |  |  |  |  |  |  |  |
Total |  | 969.4 |  |  |  | 904.7 |  |  |  | 969.4 | 904.7 |
Unrealized Gain (Loss) on Derivatives |  |  |  |  |  |  |  |  |  | 18.7 | (3.4) | (10.4)
All Other |  |  |  |  |  |  |  |  |  |  |  |
Segment Operating Income (Loss): |  |  |  |  |  |  |  |  |  |  |  |
Total operating income (loss) |  |  |  |  |  |  |  |  |  | (51.8) | (536.7) | (13.5)
Depreciation and Amortization: |  |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 0.6 | 0.5 | 0.5
Capital expenditures: |  |  |  |  |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  |  |  |  |  | 0.5 | 0.7 | 0.9
Segment assets: |  |  |  |  |  |  |  |  |  |  |  |
Total |  | $ 474.1 |  |  |  | $ 342.2 |  |  |  | 474.1 | 342.2 |
VEBAs | All Other |  |  |  |  |  |  |  |  |  |  |  |
Segment assets: |  |  |  |  |  |  |  |  |  |  |  |
Non-cash defined benefit net periodic benefit cost (income) |  |  |  |  |  |  |  |  |  | $ 3.4 | $ 2.4 | $ (23.7)
[1] | See Note 6 for the impact of removing the Union VEBA (defined in Note 6) net assets.

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