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Accumulated Other Comprehensive Income (Loss) (Tables) | 12 Months Ended
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Dec. 31, 2016
Equity [Abstract] |
Schedule of 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, 2016, 2015 and 2014 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, 2013 | $ | (718.9 | ) |  | $ | 15.3 |  |  | $ | — |  |  | $ | (9.6 | ) |  | $ | — |  |  | $ | (713.2 | )
OCI before reclassifications |  | (266.4 | ) |  |  | (32.0 | ) |  |  | — |  |  |  | 28.1 |  |  |  | — |  |  | (270.3 | )
Amounts reclassified from AOCI | (a) | 53.8 |  |  | (b) | 0.5 |  |  | (c) | — |  |  | (d) | (2.2 | ) |  |  | — |  |  | 52.1 |
Net current-period OCI |  | (212.6 | ) |  |  | (31.5 | ) |  |  | — |  |  |  | 25.9 |  |  |  | — |  |  | (218.2 | )
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 |  |  | (c) | — |  |  | (c) | — |  |  | (d) | (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 |  |  | (c) | — |  |  | (c) | — |  |  | (d) | 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 | )
Attributable to noncontrolling interests: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance, December 31, 2013 | $ | — |  |  | $ | 27.1 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 27.1 |
OCI before reclassifications |  | — |  |  |  | (2.1 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  | (2.1 | )
Amounts reclassified from AOCI |  | — |  |  | (c) | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  | — |
Net current-period OCI |  | — |  |  |  | (2.1 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  | (2.1 | )
Balance, December 31, 2014 |  | — |  |  |  | 25.0 |  |  |  | — |  |  |  | — |  |  |  | — |  |  | 25.0 |
OCI before reclassifications |  | — |  |  |  | (5.6 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  | (5.6 | )
Amounts reclassified from AOCI |  | — |  |  | (c) | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  | — |
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 |  | — |  |  | (c) | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  | — |
Net current-period OCI |  | — |  |  |  | (9.7 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  | (9.7 | )
Balance, December 31, 2016 | $ | — |  |  | $ | 9.7 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 9.7 |
(a) | Amounts were included in net periodic benefit cost for pension and other postretirement benefit plans (see Note 12).
(b) | Amount in 2014 is included in other income, net.
(c) | No amounts were reclassified to earnings.
(d) | 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).
Reclassification out of accumulated other comprehensive income | Reclassifications out of AOCI for the fiscal years ended December 31, 2016, 2015 and 2014 were as follows:
|  | Amount reclassified from AOCI (d) |  |  |
|  | Fiscal year ended |  |  |
Details about AOCI Components (In millions) |  | December 31, 2016 |  |  |  | December 31, 2015 |  | December 31, 2014 |  |  | Affected line item in the consolidated statement of operations
Postretirement benefit plans |  |  |  |  |  |  |  |  |  |  |  |
Prior service credit (cost) |  | $ | 0.4 |  |  | (a) |  | $ | (6.2 | ) | (a) | $ | 0.7 |  | (a) |  |
Actuarial losses |  | (75.0 | ) |  | (a) |  | (75.0 | ) | (a) | (88.1 | ) | (a) |  |
|  | (74.6 | ) |  | (d) |  | (81.2 | ) | (d) | (87.4 | ) | (d) |  | Total before tax
|  | (28.3 | ) |  |  |  | (31.3 | ) |  | (33.6 | ) |  |  | Tax benefit (e)
|  | $ | (46.3 | ) |  |  |  | $ | (49.9 | ) |  | $ | (53.8 | ) |  |  | Net of tax
Currency translation adjustment |  | $ | — |  |  | (d) |  | $ | — |  | (d) | $ | (0.5 | ) | (b) , (d) |  |
Derivatives |  |  |  |  |  |  |  |  |  |  |
Nickel and other raw material contracts |  | $ | (19.5 | ) |  | (c) |  | $ | (16.9 | ) | (c) | $ | (1.0 | ) | (c) |  |
Natural gas contracts |  | (14.8 | ) |  | (c) |  | (18.2 | ) | (c) | 3.4 |  | (c) |  |
Electricity contracts |  | — |  |  | (c) |  | (0.2 | ) | (c) | 0.7 |  | (c) |  |
Foreign exchange contracts |  | 26.4 |  |  | (c) |  | 53.5 |  | (c) | 0.5 |  | (c) |  |
|  | (7.9 | ) |  | (d) |  | 18.2 |  | (d) | 3.6 |  | (d) |  | Total before tax
|  | (3.0 | ) |  |  |  | 6.9 |  |  | 1.4 |  |  |  | Tax provision (benefit) (e)
|  | $ | (4.9 | ) |  |  |  | $ | 11.3 |  |  | $ | 2.2 |  |  |  | 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 12.
(b) | Amount in 2014 is included in other income, net.
(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 10).
(d) | 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.
(e) | These amounts exclude the impact of any deferred tax asset valuation allowances (see Note 15 for further explanation).

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