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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) | 9 Months Ended
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Sep. 30, 2019
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS). |
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) | 8. ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) ​ 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 The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -URI http://asc.fasb.org/topic&trid=2134417 + Details
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