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Accumulated Other Comprehensive Income (Loss) (Tables) | 3 Months Ended
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Mar. 31, 2018
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 March 31, 2018 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, 2017 | $ | (954.5 | ) |  | $ | (53.5 | ) |  | $ | — |  |  | $ | 9.0 |  |  | $ | (28.8 | ) |  | $ | (1,027.8 | )
OCI before reclassifications |  | — |  |  |  | 16.7 |  |  |  | — |  |  |  | 2.5 |  |  |  | — |  |  | 19.2 |
Amounts reclassified from AOCI | (a) | 14.3 |  |  | (b) | — |  |  | (b) | — |  |  | (c) | (2.3 | ) |  |  | 4.4 |  |  | 16.4 |
Net current-period OCI |  | 14.3 |  |  |  | 16.7 |  |  |  | — |  |  |  | 0.2 |  |  |  | 4.4 |  |  | 35.6 |
Balance, March 31, 2018 | $ | (940.2 | ) |  | $ | (36.8 | ) |  | $ | — |  |  | $ | 9.2 |  |  | $ | (24.4 | ) |  | $ | (992.2 | )
Attributable to noncontrolling interests: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance, December 31, 2017 | $ | — |  |  | $ | 17.3 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 17.3 |
OCI before reclassifications |  | — |  |  |  | 6.9 |  |  |  | — |  |  |  | — |  |  |  | — |  |  | 6.9 |
Amounts reclassified from AOCI |  | — |  |  | (b) | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  | — |
Net current-period OCI |  | — |  |  |  | 6.9 |  |  |  | — |  |  |  | — |  |  |  | — |  |  | 6.9 |
Balance, March 31, 2018 | $ | — |  |  | $ | 24.2 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 24.2 |
(a) | Amounts were included in net periodic benefit cost for pension and other postretirement benefit plans (see Note 9).
(b) | No amounts were reclassified to earnings.
(c) | Amounts related to derivatives are included in cost of goods sold in the period or periods the hedged item affects earnings (see Note 7).
The changes in AOCI by component, net of tax, for the three month period ended March 31, 2017 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, 2016 | $ | (965.5 | ) |  | $ | (85.0 | ) |  | $ | — |  |  | $ | 2.4 |  |  | $ | (45.6 | ) |  | $ | (1,093.7 | )
OCI before reclassifications |  | — |  |  |  | 8.4 |  |  |  | — |  |  |  | (1.5 | ) |  |  | (1.1 | ) |  | 5.8 |
Amounts reclassified from AOCI | (a) | 10.8 |  |  | (b) | — |  |  | (b) | — |  |  | (c) | (0.6 | ) |  |  | 6.3 |  |  | 16.5 |
Net current-period OCI |  | 10.8 |  |  |  | 8.4 |  |  |  | — |  |  |  | (2.1 | ) |  |  | 5.2 |  |  | 22.3 |
Balance, March 31, 2017 | $ | (954.7 | ) |  | $ | (76.6 | ) |  | $ | — |  |  | $ | 0.3 |  |  | $ | (40.4 | ) |  | $ | (1,071.4 | )
Attributable to noncontrolling interests: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance, December 31, 2016 | $ | — |  |  | $ | 9.7 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 9.7 |
OCI before reclassifications |  | — |  |  |  | 2.0 |  |  |  | — |  |  |  | — |  |  |  | — |  |  | 2.0 |
Amounts reclassified from AOCI |  | — |  |  | (b) | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  | — |
Net current-period OCI |  | — |  |  |  | 2.0 |  |  |  | — |  |  |  | — |  |  |  | — |  |  | $ | 2.0 |
Balance, March 31, 2017 | $ | — |  |  | $ | 11.7 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 11.7 |
(a) | Amounts were included in net periodic benefit cost for pension and other postretirement benefit plans (see Note 9).
(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 income (see Note 7).
Reclassification out of Accumulated Other Comprehensive Income | Reclassifications out of AOCI for the three month periods ended March 31, 2018 and 2017 were as follows:
| Amount reclassified from AOCI |
Details about AOCI Components (In millions) | Three months ended March 31, 2018 |  | Three months ended March 31, 2017 |  | Affected line item in the statements of income
Postretirement benefit plans |  |  |  |  |
Prior service (cost) credit | $ | 0.6 |  |  | $ | 0.4 |  | (a) |
Actuarial losses | (19.2 | ) |  | (17.8 | ) | (a) |
| (18.6 | ) |  | (17.4 | ) | (c) | Total before tax
| (4.3 | ) |  | (6.6 | ) |  | Tax provision (benefit) (d)
| $ | (14.3 | ) |  | $ | (10.8 | ) |  | Net of tax
Derivatives |  |  |  |  |
Nickel and other raw material contracts | $ | 3.7 |  |  | $ | (0.9 | ) | (b) |
Natural gas contracts | (0.4 | ) |  | (2.3 | ) | (b) |
Foreign exchange contracts | (0.3 | ) |  | 4.1 |  | (b) |
| 3.0 |  |  | 0.9 |  | (c) | Total before tax
| 0.7 |  |  | 0.3 |  |  | Tax provision (benefit) (d)
| $ | 2.3 |  |  | $ | 0.6 |  |  | Net of tax
(a) | Amounts are reported in nonoperating retirement benefit expense (see Note 9).
(b) | Amounts related to derivatives are included in cost of goods sold in the period or periods the hedged item affects earnings (see Note 7).
(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 income.
(d) | These amounts exclude the impact of any deferred tax asset valuation allowance, when applicable.

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- Definition Tabular disclosure of information about items reclassified out of accumulated other comprehensive income (loss). + References No definition available. + Details
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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=84228862&loc=SL7669686-108580 + Details
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