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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Tables) | 9 Months Ended
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Sep. 30, 2019
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, 2019 consisted of the following:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Accumulated | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | Non- | ​ | ​ | ​ | Other | ​
​ | ​ | ​ | ​ | Post- | ​ | Qualified | ​ | ​ | ​ | Comprehensive | ​
(In millions) |  | Pensions |  | Retirement |  | Plans |  | Other | ​ | Income (Loss) |
Balance at December 31, 2018 | ​ | $ | (55.8) | ​ | $ | 21.7 | ​ | $ | (0.1) | ​ | $ | (0.3) | ​ | $ | (34.5) | ​
Amortization of prior service cost | ​ | ​ | (0.4) | ​ | ​ | (0.7) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (1.1) | ​
Amortization of net loss | ​ | ​ | 0.7 | ​ | ​ | 0.2 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 0.9 | ​
Balance at March 31, 2019 | ​ | ​ | (55.5) | ​ | ​ | 21.2 | ​ | ​ | (0.1) | ​ | ​ | (0.3) | ​ | ​ | (34.7) | ​
Amortization of prior service cost | ​ | ​ | (0.5) | ​ | ​ | (0.7) | ​ | ​ | (0.1) | ​ | ​ | 0.1 | ​ | ​ | (1.2) | ​
Amortization of net loss | ​ | ​ | 0.7 | ​ | ​ | 0.1 | ​ | ​ | 0.1 | ​ | ​ | — | ​ | ​ | 0.9 | ​
Other adjustments | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (0.2) | ​ | ​ | (0.2) | ​
Balance at June 30, 2019 | ​ | ​ | (55.3) | ​ | ​ | 20.6 | ​ | ​ | (0.1) | ​ | ​ | (0.4) | ​ | ​ | (35.2) | ​
Amortization of prior service cost | ​ | ​ | (0.4) | ​ | ​ | (0.5) | ​ | ​ | (0.1) | ​ | ​ | — | ​ | ​ | (1.0) | ​
Amortization of net loss (gain) | ​ | ​ | 1.6 | ​ | ​ | (0.4) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 1.2 | ​
Other adjustments | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (0.7) | ​ | ​ | (0.7) | ​
Balance at September 30, 2019 | ​ | $ | (54.1) | ​ | $ | 19.7 | ​ | $ | (0.2) | ​ | $ | (1.1) | ​ | $ | (35.7) | ​
​ 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 (gain) | ​ | ​ | 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 (gain) | ​ | ​ | 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.

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669686-108580 + Details
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