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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Tables) | 9 Months Ended
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Sep. 30, 2018
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS). |
Schedule of changes in accumulated other comprehensive income (loss) by component, net of tax | Changes in accumulated other comprehensive income (loss) by component, net of tax, for the nine months ended September 30, 2018 consisted of the following:
|  |  |  |  |  |  |  |  |  |  | Accumulated |
|  |  |  |  |  |  | Non- |  |  |  | Other |
|  |  |  | Post |  | Qualified |  |  |  | Comprehensive |
(In millions) |  | Pensions |  | Retirement |  | Plans |  | Other |  | Income (Loss) |
Balance at December 31, 2017 |  | $ | (40.6) |  | $ | 15.6 |  | $ | (0.3) |  | $ | 0.4 |  | $ | (24.9) |
Reclassification adjustment related to the Tax Act (1) |  |  | (9.2) |  |  | 3.4 |  |  | (0.2) |  |  | — |  |  | (6.0) |
Amortization of prior service cost |  |  | (0.4) |  |  | (0.9) |  |  | — |  |  | — |  |  | (1.3) |
Amortization of net loss |  |  | 0.9 |  |  | 0.3 |  |  | 0.1 |  |  | — |  |  | 1.3 |
Other adjustments |  |  | — |  |  | — |  |  | — |  |  | 0.2 |  |  | 0.2 |
Balance at March 31, 2018 |  |  | (49.3) |  |  | 18.4 |  |  | (0.4) |  |  | 0.6 |  |  | (30.7) |
Amortization of prior service cost |  |  | (0.5) |  |  | (0.5) |  |  | (0.1) |  |  | — |  |  | (1.1) |
Amortization of net loss |  |  | 0.9 |  |  | 0.2 |  |  | 0.1 |  |  | (0.7) |  |  | 0.5 |
Other adjustments |  |  | — |  |  | — |  |  | — |  |  | (0.3) |  |  | (0.3) |
Balance at June 30, 2018 |  |  | (48.9) |  |  | 18.1 |  |  | (0.4) |  |  | (0.4) |  |  | (31.6) |
Amortization of prior service cost |  |  | (0.4) |  |  | (0.7) |  |  | — |  |  | — |  |  | (1.1) |
Amortization of net loss |  |  | 0.9 |  |  | 0.3 |  |  | (0.1) |  |  | — |  |  | 1.1 |
Other adjustments |  |  | — |  |  | — |  |  | — |  |  | 0.1 |  |  | 0.1 |
Balance at September 30, 2018 |  | $ | (48.4) |  | $ | 17.7 |  | $ | (0.5) |  | $ | (0.3) |  | $ | (31.5) |
| (1) |  | Reclassification from accumulated other comprehensive income (loss) to retained earnings for the remeasurement tax effects resulting from the Tax Act in accordance with ASU 2018-02.
Changes in accumulated other comprehensive income (loss) by component, net of tax, for the nine months ended September 30, 2017 consisted of the following:
|  |  |  |  |  |  |  |  |  |  | Accumulated |
|  |  |  |  |  |  | Non- |  |  |  | Other |
|  |  |  | Post |  | Qualified |  |  |  | Comprehensive |
(In millions) |  | Pensions |  | Retirement |  | Plans |  | Other |  | Income (Loss) |
Balance at December 31, 2016 |  | $ | (41.4) |  | $ | 18.1 |  | $ | (0.4) |  | $ | 0.1 |  | $ | (23.6) |
Amortization of prior service cost |  |  | (0.4) |  |  | — |  |  | — |  |  | — |  |  | (0.4) |
Amortization of net loss |  |  | 0.8 |  |  | 0.1 |  |  | — |  |  | — |  |  | 0.9 |
Other adjustments |  |  | — |  |  | — |  |  | — |  |  | 0.2 |  |  | 0.2 |
Balance at March 31, 2017 |  |  | (41.0) |  |  | 18.2 |  |  | (0.4) |  |  | 0.3 |  |  | (22.9) |
Net gain in prior service cost |  |  | — |  |  | — |  |  | — |  |  | 0.1 |  |  | 0.1 |
Amortization of prior service cost |  |  | (0.3) |  |  | — |  |  | — |  |  | — |  |  | (0.3) |
Amortization of net loss |  |  | 0.8 |  |  | 0.3 |  |  | 0.1 |  |  | — |  |  | 1.2 |
Balance at June 30, 2017 |  |  | (40.5) |  |  | 18.5 |  |  | (0.3) |  |  | 0.4 |  |  | (21.9) |
Net gain in prior service costs |  |  | — |  |  | 0.7 |  |  | — |  |  | — |  |  | 0.7 |
Amortization of prior service cost |  |  | (0.4) |  |  | (1.7) |  |  | (0.1) |  |  | — |  |  | (2.2) |
Amortization of net loss |  |  | 0.8 |  |  | 0.2 |  |  | — |  |  | — |  |  | 1.0 |
Balance at September 30, 2017 |  | $ | (40.1) |  | $ | 17.7 |  | $ | (0.4) |  | $ | 0.4 |  | $ | (22.4) |

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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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