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Accumulated Other Comprehensive Income (Loss) | 12 Months Ended
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Dec. 31, 2017
Equity [Abstract] |
Accumulated Other Comprehensive Income (Loss) | Accumulated Other Comprehensive Income (Loss) The changes in accumulated other comprehensive income (loss) (AOCI) by component, net of tax, for the fiscal years ended December 31, 2017, 2016 and 2015 were as follows (in millions):
| Post- retirement benefit plans |  | Currency translation adjustment |  | Unrealized holding gains on securities |  | Derivatives |  |  | Deferred Tax Asset Valuation Allowance |  | Total
Attributable to ATI: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance, December 31, 2014 | $ | (931.5 | ) |  | $ | (16.2 | ) |  | $ | — |  |  | $ | 16.3 |  |  | $ | — |  |  | $ | (931.4 | )
OCI before reclassifications |  | (69.6 | ) |  |  | (31.4 | ) |  |  | — |  |  |  | (20.7 | ) |  |  | — |  |  | (121.7 | )
Amounts reclassified from AOCI | (a) | 49.9 |  |  | (b) | — |  |  | (b) | — |  |  | (c) | (11.3 | ) |  |  | — |  |  | 38.6 |
Net current-period OCI |  | (19.7 | ) |  |  | (31.4 | ) |  |  | — |  |  |  | (32.0 | ) |  |  | — |  |  | (83.1 | )
Balance, December 31, 2015 |  | (951.2 | ) |  |  | (47.6 | ) |  |  | — |  |  |  | (15.7 | ) |  |  | — |  |  | (1,014.5 | )
OCI before reclassifications |  | (60.6 | ) |  |  | (37.4 | ) |  |  | — |  |  |  | 13.2 |  |  |  | (45.6 | ) |  | (130.4 | )
Amounts reclassified from AOCI | (a) | 46.3 |  |  | (b) | — |  |  | (b) | — |  |  | (c) | 4.9 |  |  |  | — |  |  | 51.2 |
Net current-period OCI |  | (14.3 | ) |  |  | (37.4 | ) |  |  | — |  |  |  | 18.1 |  |  |  | (45.6 | ) |  | (79.2 | )
Balance, December 31, 2016 |  | (965.5 | ) |  |  | (85.0 | ) |  |  | — |  |  |  | 2.4 |  |  |  | (45.6 | ) |  | (1,093.7 | )
OCI before reclassifications |  | (32.5 | ) |  |  | 31.5 |  |  |  | — |  |  |  | 11.1 |  |  |  | — |  |  | 10.1 |
Amounts reclassified from AOCI | (a) | 43.5 |  |  | (b) | — |  |  | (b) | — |  |  | (c) | (4.5 | ) |  |  | 16.8 |  |  | 55.8 |
Net current-period OCI |  | 11.0 |  |  |  | 31.5 |  |  |  | — |  |  |  | 6.6 |  |  |  | 16.8 |  |  | 65.9 |
Balance, December 31, 2017 | $ | (954.5 | ) |  | $ | (53.5 | ) |  | $ | — |  |  | $ | 9.0 |  |  | $ | (28.8 | ) |  | $ | (1,027.8 | )
Attributable to noncontrolling interests: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance, December 31, 2014 | $ | — |  |  | $ | 25.0 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 25.0 |
OCI before reclassifications |  | — |  |  |  | (5.6 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  | (5.6 | )
Amounts reclassified from AOCI |  | — |  |  | (b) | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  | — |
Net current-period OCI |  | — |  |  |  | (5.6 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  | (5.6 | )
Balance, December 31, 2015 |  | — |  |  |  | 19.4 |  |  |  | — |  |  |  | — |  |  |  | — |  |  | 19.4 |
OCI before reclassifications |  | — |  |  |  | (9.7 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  | (9.7 | )
Amounts reclassified from AOCI |  | — |  |  | (b) | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  | — |
Net current-period OCI |  | — |  |  |  | (9.7 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  | (9.7 | )
Balance, December 31, 2016 |  | — |  |  |  | 9.7 |  |  |  | — |  |  |  | — |  |  |  | — |  |  | 9.7 |
OCI before reclassifications |  | — |  |  |  | 7.6 |  |  |  | — |  |  |  | — |  |  |  | — |  |  | 7.6 |
Amounts reclassified from AOCI |  | — |  |  | (b) | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  | — |
Net current-period OCI |  | — |  |  |  | 7.6 |  |  |  | — |  |  |  | — |  |  |  | — |  |  | 7.6 |
Balance, December 31, 2017 | $ | — |  |  | $ | 17.3 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 17.3 |
(a) | Amounts were included in net periodic benefit cost for pension and other postretirement benefit plans (see Note 11).
(b) | No amounts were reclassified to earnings.
(c) | 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 9).
Other comprehensive income (loss) amounts (OCI) reported above by category are net of applicable income tax expense (benefit) for each year presented. Income tax expense (benefit) on OCI items is recorded as a change in a deferred tax asset or liability. Amounts recognized in OCI in 2016 and 2017 include the impact of any deferred tax asset valuation allowances (see Note 14 for further explanation), primarily relating to remeasurement of the Company’s postretirement benefit plans. Foreign currency translation adjustments, including those pertaining to noncontrolling interests, are generally not adjusted for income taxes as they relate to indefinite investments in non-U.S. subsidiaries. Reclassifications out of AOCI for the fiscal years ended December 31, 2017, 2016 and 2015 were as follows:
|  | Amount reclassified from AOCI (c) |  |  |
|  | Fiscal year ended |  |  |
Details about AOCI Components (In millions) |  | December 31, 2017 |  |  |  | December 31, 2016 |  | December 31, 2015 |  |  | Affected line item in the consolidated statement of operations
Postretirement benefit plans |  |  |  |  |  |  |  |  |  |  |  |
Prior service credit (cost) |  | $ | 1.6 |  |  | (a) |  | $ | 0.4 |  | (a) | $ | (6.2 | ) | (a) |  |
Actuarial losses |  | (71.6 | ) |  | (a) |  | (75.0 | ) | (a) | (75.0 | ) | (a) |  |
|  | (70.0 | ) |  | (c) |  | (74.6 | ) | (c) | (81.2 | ) | (c) |  | Total before tax
|  | (26.5 | ) |  |  |  | (28.3 | ) |  | (31.3 | ) |  |  | Tax benefit (d)
|  | $ | (43.5 | ) |  |  |  | $ | (46.3 | ) |  | $ | (49.9 | ) |  |  | Net of tax
Derivatives |  |  |  |  |  |  |  |  |  |  |
Nickel and other raw material contracts |  | $ | (3.4 | ) |  | (b) |  | $ | (19.5 | ) | (b) | $ | (16.9 | ) | (b) |  |
Natural gas contracts |  | (5.3 | ) |  | (b) |  | (14.8 | ) | (b) | (18.2 | ) | (b) |  |
Electricity contracts |  | — |  |  | (b) |  | — |  | (b) | (0.2 | ) | (b) |  |
Foreign exchange contracts |  | 15.9 |  |  | (b) |  | 26.4 |  | (b) | 53.5 |  | (b) |  |
|  | 7.2 |  |  | (c) |  | (7.9 | ) | (c) | 18.2 |  | (c) |  | Total before tax
|  | 2.7 |  |  |  |  | (3.0 | ) |  | 6.9 |  |  |  | Tax provision (benefit) (d)
|  | $ | 4.5 |  |  |  |  | $ | (4.9 | ) |  | $ | 11.3 |  |  |  | Net of tax
(a) | 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 11.
(b) | 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 9).
(c) | 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.
(d) | These amounts exclude the impact of any deferred tax asset valuation allowances (see Note 14 for further explanation).

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- Definition The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -URI http://asc.fasb.org/topic&trid=2134417 + Details
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