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Accumulated Other Comprehensive Income (Loss) (Details2) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Amortization to net income (loss) of net prior service cost (credits) |  | $ (0.4) | $ 6.2 | $ (0.7) |
Amortization of net actuarial loss |  | 75.0 | 75.0 | 88.1 |
Cost of sales |  | (2,972.1) | (3,659.3) | (3,844.8) |
Income (loss) from continuing operations before income taxes |  | (734.0) | (478.0) | 1.5 |
Income tax benefit |  | (106.9) | (112.1) | (8.7) |
Income (loss) from continuing operations |  | (627.1) | (365.9) | 10.2 |
Reclassification out of Accumulated Other Comprehensive Income [Member] | Post- retirement benefit plans [Member] |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Amortization to net income (loss) of net prior service cost (credits) | [1] | 0.4 | (6.2) | 0.7 |
Amortization of net actuarial loss | [1] | (75.0) | (75.0) | (88.1) |
Income (loss) from continuing operations before income taxes | [2] | (74.6) | (81.2) | (87.4) |
Income tax benefit | [3] | (28.3) | (31.3) | (33.6) |
Income (loss) from continuing operations |  | (46.3) | (49.9) | (53.8) |
Reclassification out of Accumulated Other Comprehensive Income [Member] | Currency translation adjustment [Member] |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Income (loss) from continuing operations | [2] | 0.0 | 0.0 | (0.5) | [4]
Reclassification out of Accumulated Other Comprehensive Income [Member] | Derivatives [Member] |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Income (loss) from continuing operations before income taxes | [2] | (7.9) | 18.2 | 3.6 |
Income tax benefit | [3] | (3.0) | 6.9 | 1.4 |
Income (loss) from continuing operations |  | (4.9) | 11.3 | 2.2 |
Reclassification out of Accumulated Other Comprehensive Income [Member] | Derivatives [Member] | Nickel and other raw material contracts [Member] |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Cost of sales | [5] | (19.5) | (16.9) | (1.0) |
Reclassification out of Accumulated Other Comprehensive Income [Member] | Derivatives [Member] | Natural gas contracts [Member] |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Cost of sales | [5] |  |  | 3.4 |
Cost of Goods Sold and Selling, General and Administrative Expenses | [5] | (14.8) | (18.2) |  |
Reclassification out of Accumulated Other Comprehensive Income [Member] | Derivatives [Member] | Electricity contracts [Member] |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Cost of sales | [5] | 0.0 | (0.2) | 0.7 |
Reclassification out of Accumulated Other Comprehensive Income [Member] | Derivatives [Member] | Foreign Exchange Contract [Member] |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Cost of sales | [5] | $ 26.4 |  | $ 0.5 |
Cost of Goods Sold and Selling, General and Administrative Expenses | [5] |  | $ 53.5 |  |
[1] | Amounts are included in the computation of pension and other postretirement benefit expense, which is reported in both cost of goods sold and selling and administrative expenses. For additional information, see Note 12.
[2] | For pretax items, positive amounts are income and negative amounts are expense in terms of the impact to net income. Tax effects are presented in conformity with ATI’s presentation in the consolidated statements of operations.
[3] | These amounts exclude the impact of any deferred tax asset valuation allowances (see Note 15 for further explanation).
[4] | Amount in 2014 is included in other income, net.
[5] | Amounts related to the effective portion of the derivatives are included in cost of goods sold in the period or periods the hedged item affects earnings. Amounts related to the ineffective portion of the derivatives are presented in selling and administrative expenses on the consolidated statements of operations (see Note 10).

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- Definition Amount before tax of reclassification adjustment from accumulated other comprehensive (income) loss for prior service cost (credit) related to pension and other postretirement benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669646-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e637-108580 + Details
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