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Accumulated Other Comprehensive Income (Loss) (Tables) | 9 Months Ended
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Sep. 30, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |
Schedule Of Accumulated Other Comprehensive Income Loss | The changes in accumulated other comprehensive income (loss) (AOCI) by component, net of tax, for the three month period ended September 30, 2016 were as follows (in millions):
| Post- retirement benefit plans |  | Currency translation adjustment |  | Unrealized holding gains on securities |  | Derivatives |  | Total
Attributable to ATI: |  |  |  |  |  |  |  |  |  |  |  |  |
Balance, June 30, 2016 | $ | (913.7 | ) |  | $ | (59.8 | ) |  | $ | — |  |  | $ | (0.2 | ) |  | $ | (973.7 | )
OCI before reclassifications |  | — |  |  |  | (2.8 | ) |  |  | — |  |  |  | 3.0 |  |  | 0.2 |
Amounts reclassified from AOCI | (a) | 11.4 |  |  | (b) | — |  |  | (b) | — |  |  | (c) | 0.4 |  |  | 11.8 |
Net current-period OCI |  | 11.4 |  |  |  | (2.8 | ) |  |  | — |  |  |  | 3.4 |  |  | 12.0 |
Balance, September 30, 2016 | $ | (902.3 | ) |  | $ | (62.6 | ) |  | $ | — |  |  | $ | 3.2 |  |  | $ | (961.7 | )
Attributable to noncontrolling interests: |  |  |  |  |  |  |  |  |  |  |  |  |
Balance, June 30, 2016 | $ | — |  |  | $ | 16.4 |  |  | $ | — |  |  | $ | — |  |  | $ | 16.4 |
OCI before reclassifications |  | — |  |  |  | (1.6 | ) |  |  | — |  |  |  | — |  |  | (1.6 | )
Amounts reclassified from AOCI |  | — |  |  | (b) | — |  |  |  | — |  |  |  | — |  |  | — |
Net current-period OCI |  | — |  |  |  | (1.6 | ) |  |  | — |  |  |  | — |  |  | (1.6 | )
Balance, September 30, 2016 | $ | — |  |  | $ | 14.8 |  |  | $ | — |  |  | $ | — |  |  | $ | 14.8 |
The changes in AOCI by component, net of tax, for the nine month period ended September 30, 2016 were as follows (in millions):
| Post- retirement benefit plans |  | Currency translation adjustment |  | Unrealized holding gains on securities |  | Derivatives |  | Total
Attributable to ATI: |  |  |  |  |  |  |  |  |  |  |  |  |
Balance, December 31, 2015 | $ | (951.2 | ) |  | $ | (47.6 | ) |  | $ | — |  |  | $ | (15.7 | ) |  | $ | (1,014.5 | )
OCI before reclassifications |  | 13.9 |  |  |  | (15.0 | ) |  |  | — |  |  |  | 13.6 |  |  | 12.5 |
Amounts reclassified from AOCI | (a) | 35.0 |  |  | (b) | — |  |  | (b) | — |  |  | (c) | 5.3 |  |  | 40.3 |
Net current-period OCI |  | 48.9 |  |  |  | (15.0 | ) |  |  | — |  |  |  | 18.9 |  |  | 52.8 |
Balance, September 30, 2016 | $ | (902.3 | ) |  | $ | (62.6 | ) |  | $ | — |  |  | $ | 3.2 |  |  | $ | (961.7 | )
Attributable to noncontrolling interests: |  |  |  |  |  |  |  |  |  |  |  |  |
Balance, December 31, 2015 | $ | — |  |  | $ | 19.4 |  |  | $ | — |  |  | $ | — |  |  | $ | 19.4 |
OCI before reclassifications |  | — |  |  |  | (4.6 | ) |  |  | — |  |  |  | — |  |  | (4.6 | )
Amounts reclassified from AOCI |  | — |  |  | (b) | — |  |  |  | — |  |  |  | — |  |  | — |
Net current-period OCI |  | — |  |  |  | (4.6 | ) |  |  | — |  |  |  | — |  |  | (4.6 | )
Balance, September 30, 2016 | $ | — |  |  | $ | 14.8 |  |  | $ | — |  |  | $ | — |  |  | $ | 14.8 |
(a) | Amounts were included in net periodic benefit cost for pension and other postretirement benefit plans (see Note 7).
(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 statement of operations (see Note 5).
The changes in AOCI by component, net of tax, for the three month period ended September 30, 2015 were as follows (in millions):
| Post- retirement benefit plans |  | Currency translation adjustment |  | Unrealized holding gains on securities |  | Derivatives |  | Total
Attributable to ATI: |  |  |  |  |  |  |  |  |  |  |  |  |
Balance, June 30, 2015 | $ | (906.5 | ) |  | $ | (19.0 | ) |  | $ | (0.1 | ) |  | $ | 18.3 |  |  | $ | (907.3 | )
OCI before reclassifications |  | — |  |  |  | (12.1 | ) |  |  | — |  |  |  | (16.5 | ) |  | (28.6 | )
Amounts reclassified from AOCI | (a) | 12.5 |  |  | (b) | — |  |  | (b) | — |  |  | (c) | (2.0 | ) |  | 10.5 |
Net current-period OCI |  | 12.5 |  |  |  | (12.1 | ) |  |  | — |  |  |  | (18.5 | ) |  | (18.1 | )
Balance, September 30, 2015 | $ | (894.0 | ) |  | $ | (31.1 | ) |  | $ | (0.1 | ) |  | $ | (0.2 | ) |  | $ | (925.4 | )
Attributable to noncontrolling interests: |  |  |  |  |  |  |  |  |  |  |  |  |
Balance, June 30, 2015 | $ | — |  |  | $ | 25.3 |  |  | $ | — |  |  | $ | — |  |  | $ | 25.3 |
OCI before reclassifications |  | — |  |  |  | (4.1 | ) |  |  | — |  |  |  | — |  |  | (4.1 | )
Amounts reclassified from AOCI |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  | — |
Net current-period OCI |  | — |  |  |  | (4.1 | ) |  |  | — |  |  |  | — |  |  | $ | (4.1 | )
Balance, September 30, 2015 | $ | — |  |  | $ | 21.2 |  |  | $ | — |  |  | $ | — |  |  | $ | 21.2 |
The changes in AOCI by component, net of tax, for the nine month period ended September 30, 2015 were as follows (in millions):
| Post- retirement benefit plans |  | Currency translation adjustment |  | Unrealized holding gains on securities |  | Derivatives |  | Total
Attributable to ATI: |  |  |  |  |  |  |  |  |  |  |  |  |
Balance, December 31, 2014 | $ | (931.5 | ) |  | $ | (16.2 | ) |  | $ | — |  |  | $ | 16.3 |  |  | $ | (931.4 | )
OCI before reclassifications |  | — |  |  |  | (14.9 | ) |  |  | (0.1 | ) |  |  | (11.5 | ) |  | (26.5 | )
Amounts reclassified from AOCI | (a) | 37.5 |  |  | (b) | — |  |  | (b) | — |  |  | (c) | (5.0 | ) |  | 32.5 |
Net current-period OCI |  | 37.5 |  |  |  | (14.9 | ) |  |  | (0.1 | ) |  |  | (16.5 | ) |  | 6.0 |
Balance, September 30, 2015 | $ | (894.0 | ) |  | $ | (31.1 | ) |  | $ | (0.1 | ) |  | $ | (0.2 | ) |  | $ | (925.4 | )
Attributable to noncontrolling interests: |  |  |  |  |  |  |  |  |  |  |  |  |
Balance, December 31, 2014 | $ | — |  |  | $ | 25.0 |  |  | $ | — |  |  | $ | — |  |  | $ | 25.0 |
OCI before reclassifications |  | — |  |  |  | (3.8 | ) |  |  | — |  |  |  | — |  |  | (3.8 | )
Amounts reclassified from AOCI |  | — |  |  | (b) | — |  |  |  | — |  |  |  | — |  |  | — |
Net current-period OCI |  | — |  |  |  | (3.8 | ) |  |  | — |  |  |  | — |  |  | $ | (3.8 | )
Balance, September 30, 2015 | $ | — |  |  | $ | 21.2 |  |  | $ | — |  |  | $ | — |  |  | $ | 21.2 |
(a) | Amounts were included in net periodic benefit cost for pension and other postretirement benefit plans (see Note 7).
(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 statement of operations (see Note 5).
Reclassification out of Accumulated Other Comprehensive Income | Reclassifications out of AOCI for the three and nine month periods ended September 30, 2016 and 2015 were as follows:
| Amount reclassified from AOCI |
Details about AOCI Components (In millions) | Three months ended September 30, 2016 |  | Three months ended September 30, 2015 |  |  | Nine months ended September 30, 2016 |  | Nine months ended September 30, 2015 |  | Affected line item in the statements of operations
Postretirement benefit plans |  |  |  |  |  |  |  |  |  |
Prior service (cost) credit | $ | 0.4 |  |  | $ | (1.5 | ) | (a) |  | $ | — |  |  | $ | (4.5 | ) | (a) |
Actuarial losses | (18.7 | ) |  | (18.8 | ) | (a) |  | (56.2 | ) |  | (56.2 | ) | (a) |
| (18.3 | ) |  | (20.3 | ) | (c) |  | (56.2 | ) |  | (60.7 | ) | (c) | Total before tax
| (6.9 | ) |  | (7.8 | ) |  |  | (21.2 | ) |  | (23.2 | ) |  | Tax benefit
| $ | (11.4 | ) |  | $ | (12.5 | ) |  |  | $ | (35.0 | ) |  | $ | (37.5 | ) |  | Net of tax
Derivatives |  |  |  |  |  |  |  |  |  |
Nickel and other raw material contracts | $ | (3.5 | ) |  | $ | (3.9 | ) | (b) |  | $ | (15.9 | ) |  | $ | (11.4 | ) | (b) |
Natural gas contracts | (2.5 | ) |  | (2.6 | ) | (b) |  | (13.5 | ) |  | (10.4 | ) | (b) |
Electricity contracts | — |  |  | — |  | (b) |  | — |  |  | (0.2 | ) | (b) |
Foreign exchange contracts | 5.4 |  |  | 9.8 |  | (b) |  | 20.9 |  |  | 30.1 |  | (b) |
| (0.6 | ) |  | 3.3 |  | (c) |  | (8.5 | ) |  | 8.1 |  | (c) | Total before tax
| (0.2 | ) |  | 1.3 |  |  |  | (3.2 | ) |  | 3.1 |  |  | Tax provision (benefit)
| $ | (0.4 | ) |  | $ | 2.0 |  |  |  | $ | (5.3 | ) |  | $ | 5.0 |  |  | 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 7.
(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 statement of operations (see Note 5).
(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.

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669686-108580 + Details
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