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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Changes in accumulated other comprehensive loss by component, net of taxes |  |
Balance at the beginning of the period | $ 755.3 | $ 677.2
Amortization of prior service cost | (1.1) | (1.3)
Amortization of net loss | 0.9 | 1.3
Other adjustments |  | 0.2
Balance at the end of the period | 763.0 | 681.4
Pensions |  |
Changes in accumulated other comprehensive loss by component, net of taxes |  |
Balance at the beginning of the period | (55.8) | (40.6)
Reclassification adjustment related to the Tax Act |  | (9.2)
Amortization of prior service cost | (0.4) | (0.4)
Amortization of net loss | 0.7 | 0.9
Balance at the end of the period | (55.5) | (49.3)
Post Retirement |  |
Changes in accumulated other comprehensive loss by component, net of taxes |  |
Balance at the beginning of the period | 21.7 | 15.6
Reclassification adjustment related to the Tax Act |  | 3.4
Amortization of prior service cost | (0.7) | (0.9)
Amortization of net loss | 0.2 | 0.3
Balance at the end of the period | 21.2 | 18.4
Non-Qualified Plans |  |
Changes in accumulated other comprehensive loss by component, net of taxes |  |
Balance at the beginning of the period | (0.1) | (0.3)
Reclassification adjustment related to the Tax Act |  | (0.2)
Amortization of net loss |  | 0.1
Balance at the end of the period | (0.1) | (0.4)
Other |  |
Changes in accumulated other comprehensive loss by component, net of taxes |  |
Balance at the beginning of the period | (0.3) | 0.4
Other adjustments |  | 0.2
Balance at the end of the period | (0.3) | 0.6
Accumulated Other Comprehensive Income (Loss) |  |
Changes in accumulated other comprehensive loss by component, net of taxes |  |
Balance at the beginning of the period | (34.5) | (24.9)
Reclassification adjustment related to the Tax Act |  | (6.0)
Amortization of prior service cost | (1.1) | (1.3)
Amortization of net loss | 0.9 | 1.3
Other adjustments |  | 0.2
Balance at the end of the period | $ (34.7) | $ (30.7)

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