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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Changes in accumulated other comprehensive income (loss) by component, net of taxes |  |
Balance at the beginning of the period | $ 961.2 | $ 805.7
Amortization of prior service cost | (1.1) | (1.2)
Amortization of net loss | 1.2 | 1.3
Other adjustments | (0.2) | (0.7)
Balance at the end of the period | 1,028.9 | 800.2
Pensions |  |
Changes in accumulated other comprehensive income (loss) by component, net of taxes |  |
Balance at the beginning of the period | (61.7) | (51.9)
Amortization of prior service cost | (0.4) | (0.5)
Amortization of net loss | 0.9 | 1.1
Balance at the end of the period | (61.2) | (51.3)
Post Retirement |  |
Changes in accumulated other comprehensive income (loss) by component, net of taxes |  |
Balance at the beginning of the period | 12.2 | 16.3
Amortization of prior service cost | (0.7) | (0.6)
Amortization of net loss | 0.2 | 0.1
Balance at the end of the period | 11.7 | 15.8
Non-Qualified Plans |  |
Changes in accumulated other comprehensive income (loss) by component, net of taxes |  |
Balance at the beginning of the period | (0.6) | (0.4)
Amortization of prior service cost |  | (0.1)
Amortization of net loss | 0.1 | 0.1
Balance at the end of the period | (0.5) | (0.4)
Other |  |
Changes in accumulated other comprehensive income (loss) by component, net of taxes |  |
Balance at the beginning of the period | (0.7) | (0.9)
Foreign currency exchange | (0.2) | (0.5)
Other adjustments |  | (0.2)
Balance at the end of the period | (0.9) | (1.6)
Accumulated Other Comprehensive Income (Loss) |  |
Changes in accumulated other comprehensive income (loss) by component, net of taxes |  |
Balance at the beginning of the period | (50.8) | (36.9)
Amortization of prior service cost | (1.1) | (1.2)
Amortization of net loss | 1.2 | 1.3
Foreign currency exchange | (0.2) | (0.5)
Other adjustments |  | (0.2)
Balance at the end of the period | $ (50.9) | $ (37.5)

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