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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Changes in accumulated other comprehensive income (loss) by component, net of taxes |  |  |  |  |  |  |  |
Balance at the beginning of the period | $ 1,172.8 | $ 1,028.9 | $ 961.2 | $ 815.5 | $ 800.2 | $ 805.7 | $ 961.2 | $ 805.7
Amortization of prior service cost | (1.1) |  |  | (1.2) |  |  | (3.4) | (3.5)
Amortization of net loss (gain) | 1.0 |  |  | 0.5 |  |  | 3.5 | 3.1
Other adjustments | (0.1) |  |  | 0.2 |  |  | (0.2) | (0.6)
Balance at the end of the period | 1,344.8 | 1,172.8 | 1,028.9 | 891.8 | 815.5 | 800.2 | 1,344.8 | 891.8
Pensions |  |  |  |  |  |  |  |
Changes in accumulated other comprehensive income (loss) by component, net of taxes |  |  |  |  |  |  |  |
Balance at the beginning of the period | (60.6) | (61.2) | (61.7) | (50.6) | (51.3) | (51.9) | (61.7) | (51.9)
Amortization of prior service cost | (0.5) | (0.4) | (0.4) | (0.4) | (0.4) | (0.5) |  |
Amortization of net loss (gain) | 1.0 | 1.0 | 0.9 | 0.3 | 1.1 | 1.1 |  |
Balance at the end of the period | (60.1) | (60.6) | (61.2) | (50.7) | (50.6) | (51.3) | (60.1) | (50.7)
Post Retirement |  |  |  |  |  |  |  |
Changes in accumulated other comprehensive income (loss) by component, net of taxes |  |  |  |  |  |  |  |
Balance at the beginning of the period | 11.3 | 11.7 | 12.2 | 15.2 | 15.8 | 16.3 | 12.2 | 16.3
Amortization of prior service cost | (0.6) | (0.7) | (0.7) | (0.8) | (0.7) | (0.6) |  |
Amortization of net loss (gain) |  | 0.3 | 0.2 | 0.3 | 0.1 | 0.1 |  |
Balance at the end of the period | 10.7 | 11.3 | 11.7 | 14.7 | 15.2 | 15.8 | 10.7 | 14.7
Non-Qualified Plans |  |  |  |  |  |  |  |
Changes in accumulated other comprehensive income (loss) by component, net of taxes |  |  |  |  |  |  |  |
Balance at the beginning of the period | (0.6) | (0.5) | (0.6) | (0.3) | (0.4) | (0.4) | (0.6) | (0.4)
Amortization of prior service cost |  | (0.1) |  |  |  | (0.1) |  |
Amortization of net loss (gain) |  |  | 0.1 | (0.1) | 0.1 | 0.1 |  |
Balance at the end of the period | (0.6) | (0.6) | (0.5) | (0.4) | (0.3) | (0.4) | (0.6) | (0.4)
Other |  |  |  |  |  |  |  |
Changes in accumulated other comprehensive income (loss) by component, net of taxes |  |  |  |  |  |  |  |
Balance at the beginning of the period | (0.8) | (0.9) | (0.7) | (1.7) | (1.6) | (0.9) | (0.7) | (0.9)
Foreign currency exchange | (0.1) | (0.1) | (0.2) | 0.1 | 0.3 | (0.5) |  |
Other adjustments |  | 0.2 |  | 0.1 | (0.4) | (0.2) |  |
Balance at the end of the period | (0.9) | (0.8) | (0.9) | (1.5) | (1.7) | (1.6) | (0.9) | (1.5)
Accumulated Other Comprehensive Income (Loss) |  |  |  |  |  |  |  |
Changes in accumulated other comprehensive income (loss) by component, net of taxes |  |  |  |  |  |  |  |
Balance at the beginning of the period | (50.7) | (50.9) | (50.8) | (37.4) | (37.5) | (36.9) | (50.8) | (36.9)
Amortization of prior service cost | (1.1) | (1.2) | (1.1) | (1.2) | (1.1) | (1.2) |  |
Amortization of net loss (gain) | 1.0 | 1.3 | 1.2 | 0.5 | 1.3 | 1.3 |  |
Foreign currency exchange | (0.1) | (0.1) | (0.2) | 0.1 | 0.3 | (0.5) |  |
Other adjustments |  | 0.2 |  | 0.1 | (0.4) | (0.2) |  |
Balance at the end of the period | $ (50.9) | $ (50.7) | $ (50.9) | $ (37.9) | $ (37.4) | $ (37.5) | $ (50.9) | $ (37.9)

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