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Accumulated Other Comprehensive Income (Loss) (Details 2) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Amortization to net income (loss) of net prior service cost (credit) |  | $ (0.4) | $ 1.5 | $ 0.0 | $ 4.5
Amount reclassified from AOCI, Postretirement benefit plans, Actuarial losses |  | 18.7 | 18.8 | 56.2 | 56.2
Income (loss) before income tax provision (benefit) |  | (531.5) | (117.9) | (705.2) | (118.9)
Income tax provision (benefit) |  | (4.3) | 23.4 | (64.4) | 23.7
Cost of sales |  | (720.3) | (861.4) | (2,273.3) | (2,822.9)
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 (credit) | [1] | 0.4 | (1.5) | 0.0 | (4.5)
Amount reclassified from AOCI, Postretirement benefit plans, Actuarial losses | [1] | (18.7) | (18.8) | (56.2) | (56.2)
Income (loss) before income tax provision (benefit) | [2] | (18.3) | (20.3) | (56.2) | (60.7)
Income tax provision (benefit) |  | (6.9) | (7.8) | (21.2) | (23.2)
Net income (loss) |  | (11.4) | (12.5) | (35.0) | (37.5)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Derivatives [Member] |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Income (loss) before income tax provision (benefit) | [2] | (0.6) | 3.3 | (8.5) | 8.1
Income tax provision (benefit) |  | (0.2) | 1.3 | (3.2) | 3.1
Net income (loss) |  | (0.4) | 2.0 | (5.3) | 5.0
Reclassification out of Accumulated Other Comprehensive Income [Member] | Derivatives [Member] | Nickel and other raw material contracts |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Cost of sales | [3] | (3.5) | (3.9) | (15.9) | (11.4)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Derivatives [Member] | Natural gas contracts |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Cost of sales | [3] |  | (2.6) |  | (10.4)
Cost of Sales and Selling and Administrative Expenses | [3] | (2.5) |  | (13.5) |
Reclassification out of Accumulated Other Comprehensive Income [Member] | Derivatives [Member] | Electricity contracts |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Cost of sales | [3] | 0.0 | 0.0 | 0.0 | (0.2)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Derivatives [Member] | Foreign exchange contracts |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Cost of sales | [3] | $ 5.4 | $ 9.8 | $ 20.9 | $ 30.1
[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 7.
[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] | 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 statement of operations (see Note 5).

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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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